Any more in-depth info on the YR1035+ battery tester / milliohm meter? - Page 1
Forum section: electronics / testgear

author: Rooster Cogburn
author_rank: Regular Contributor
timestamp: July 30, 2024, 03:14:45 pm
content: I just got my YR1035+ battery tester today. Seems to work fine. I primarily got it for measuring LiIon batteries but it seems it makes for a competent milliohm meter in general. I tried to use it for short finding and it can reliably find the shorted component between a number of parallel resistors. There are apparently some more advanced options and features but I can't really find a good manual. They all seem to be poorly translated and there are some differences between units. I assume mine is a clone since the 'YAOREA' name is absent from the front panel. Says version 2.2206 on startup.Specifically, I'd be interested in the following:- In one of the manuals I've found it says holding the HOLD key activates relative measurement. My unit doesn't seem to do that?- I've seen some pictures with 'ZR' displayed under the measurement range indicators and some AE descriptions referencing 'ZR mode' and having it enabled by default. What is it and how do I turn it on?- Menu option 7 & 8, calibration & factory reset seem to be disabled on my unit? I've read that some manufacturers do that. I don't think my unit needs calibration right now, but is there anything I can do to re-enable those?- Menu option 9 has a sub-menu with two options 'BU' (set to 'OFF') and 'CR' (set to '7'). What are those?- How safe is it to use this as a milliohm meter in a circuit? Like, what kind of voltage / current ranges am I exposing the circuit to?Please let me know if you can answer any of these questions or have a better manual etc., thanks!

author: RAPo
author_rank: Super Contributor
timestamp: July 30, 2024, 05:33:53 pm
content: Does thislinkhelp?

author: DaneLaw
author_rank: Frequent Contributor
timestamp: July 30, 2024, 05:55:49 pm
content: search the forum it's been debated before.

author: Rooster Cogburn
author_rank: Regular Contributor
timestamp: July 30, 2024, 06:32:33 pm
content: Quote from: RAPo on July 30, 2024, 05:33:53 pmSeen that before, doesn't answer any of my questionsQuote from: DaneLaw on July 30, 2024, 05:55:49 pmI did, nothing shows up.One issue is that the YR1030/YR1035/YR2050/RC3563 and their various clones/off-brand units all seem to be kind of the same thing yet slightly different

author: Phil1977
author_rank: Frequent Contributor
timestamp: July 30, 2024, 07:04:44 pm
content: I have a RC3563 and like it quite much.The biggest issue with these 4-wire-meters is that they do not do a plausibility check of the 4W-connection. A keysight benchtop DMM displays no reading when one of the 4 wires is not connected, but the RC3563 often displays instable or inplausibly low or high values in that case. I don't want to complain due to the fact that you can get around 100 instruments of one type for the other, but it´s good to know that there is a cause for false readings.Due to the same reason I build some pseudo-4W-test-leads where the L- and U-lines are both soldered to a short and sharp test needle. That way the contact resistance is of course not compensated, but for quick comparison of many parts it´s more reliable - and you can always fall back to the true 4W-leads if doubts arise.Beside that it´s a really versatile tool. Not only for batteries but e.g. also for in-circuit test of capacitors or as a milliohm-meter for plugs or switches.

author: Rooster Cogburn
author_rank: Regular Contributor
timestamp: July 30, 2024, 09:09:08 pm
content: Quote from: Phil1977 on July 30, 2024, 07:04:44 pmImmediately noticed that, at least it's common among this family of devices.Quote from: Phil1977 on July 30, 2024, 07:04:44 pmI thought about that as well, still have some DIY DMM probes lying around I could use for that. But wouldn't that effectively only eliminate the resistance of the leads from the equation? I'd assume contact resistance is the far bigger issue. When trying to use this meter in-circuit I noticed the dual tipped probes are too far apart to ever make contact with SMD parts. Maybe I should try ordering a clamp lead for it?Quote from: Phil1977 on July 30, 2024, 07:04:44 pmAhh, yes, it used AC for resistance measurements, right? I already have an in-circuit ESR meter, was more thinking about using it for short finding. In a quick test I setup it was perfectly able to indentify which of the several resistors was the 0-Ohm one, so it should work.I'll have to measure the current flow with my clamp meter but the open line voltage was already quite high. I'd be a bit afraid I'd fry something when doing measurements.

author: thm_w
author_rank: Super Contributor
timestamp: July 30, 2024, 11:53:57 pm
content: It looks like the unloaded voltage is quite high (5V), so could damage some sensitive circuits. But probably anything consumer level should be OK. The current level is very low (~1mA).https://lygte-info.dk/review/InternalResistanceMeterYR1035%20UK.html

author: Rooster Cogburn
author_rank: Regular Contributor
timestamp: July 31, 2024, 12:05:14 am
content: Quote from: thm_w on July 30, 2024, 11:53:57 pmYes, the open line voltage is high :/ Question is how quick it adjusts. For instance you can have a current limited PSU but still zap LEDs because of the smoothing cap on the output. It will current limit, but not until the LED is fried. Ideally it would have a voltage low enough so it doesn't even activate most semiconductors. I've seen the page you linked before but I think I'll need to do my own measurements with my scope and clamp meter just because there are so many versions of this thing. Even if the one in the link seems safe, who knows what my 3rd iteration knock-off version does.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: July 31, 2024, 01:22:39 am
content: Quote from: Rooster Cogburn on July 30, 2024, 06:32:33 pmhttps://www.eevblog.com/forum/testgear/yr2050-milliohm-meter-high-precision-handheld-dc/*thread for the other models also.. also recall I highlighted the differences between the different models of 1030/1035 branded vs non-branded and the difference in menu & tolerances/counts..(#35)

author: Rooster Cogburn
author_rank: Regular Contributor
timestamp: July 31, 2024, 07:59:22 am
content: Quote from: DaneLaw on July 31, 2024, 01:22:39 amI've seen that but that's a totally different model, just look at the physical / on-screen UI, menus etc., only mentions the 1035+ tangentially, doesn't really answer any of my questions

author: Phil1977
author_rank: Frequent Contributor
timestamp: July 31, 2024, 08:21:56 am
content: Quote from: Rooster Cogburn on July 30, 2024, 09:09:08 pmI´d build clamp leads for it. The quality you get if u build test leads yourself is so much better than everything you can get in the price class of these instruments.Of course you´re right, you only compensate the test leads, but this means you can use thin and flexible test leads and cheap connectors all the way - that´s already a big advantage and - on the other hand - the contact resistance variation is quite low in most cases you use it on battery terminals or PCBs. So it´s absolutely okay to compare values, e.g. to find a short.Quote from: Rooster Cogburn on July 30, 2024, 09:09:08 pmYes, it uses 1kHz AC - else you couldn't measure a charged battery. Nice side effect is you technically can measure also charged capacitors in circuit.My unit uses around 1V RMS with open load and the following short circuit currents (measured with shunt resistor + scope)20mOhm range: 46mA RMS200mOhm and 2 Ohm range: 5mA RMS20Ohm and larger: 0.5mA RMSThat means the maximum power dissipation in the DUT is 2 Ohm * (5mA)^2 = 0.05mW. While ranges are switched 50mW may be possible. That´s from my point of view very safe to work on power components (at least safe to the components)Attached is a pic of the DIY-testleads. Costs are <10€, they´re not beautiful but they´re really versatile and more reliable than the pogo-pin ones out of the package. The DuPont-plugs in the middle can also be used to directly measure into groundplanes if any connector has two GND-pins next to each other.

author: pcprogrammer
author_rank: Super Contributor
timestamp: July 31, 2024, 09:42:33 am
content: Quote from: Rooster Cogburn on July 30, 2024, 06:32:33 pmWell it did shed light on the CR setting. It is the contrast ratio of the display and on low settings it gets less readable.The Bu I don't fully get. It is some buffer function that might be needed when measuring on battery packs with a voltage higher than 30V to avoid sparks?I own one too and same as yours does not have options 7 and 8 filled in.To see what kind of voltages it uses you could hook it up to an oscilloscope while measuring a battery.

author: Rooster Cogburn
author_rank: Regular Contributor
timestamp: July 31, 2024, 09:56:52 am
content: Quote from: Phil1977 on July 31, 2024, 08:21:56 amAlright, might give that a shot. Got all the parts, just need to source that strange 4-pin barrel connector. I believe that is called an 'aviation connector'?Quote from: Phil1977 on July 31, 2024, 08:21:56 amWhen I read elsewhere it uses AC it immediately made sense, was already wondering how they measure the resistance on a live battery. I have a Peak ESR70+ in-circuit ESR meter with automatic discharging, curious to see how they compare!Quote from: Phil1977 on July 31, 2024, 08:21:56 amSounds good. I'll use my scope & clamp meter and see how mine looks.Quote from: Phil1977 on July 31, 2024, 08:21:56 amThose look very nice, like the DuPont connector to make the probes / clamps swappable. I wish the pogo pins in the original leads were maybe angled towards each other so you could hit SMD parts and small PCB probe points.Quote from: pcprogrammer on July 31, 2024, 09:42:33 amOh, totally missed that, why isn't that just next to the Backlight settings, so weird. I didn't get the sparks thing about the BU setting. I'll use my scope & clamp meter when I got some time, until then it's just measuring batteries!

author: Phil1977
author_rank: Frequent Contributor
timestamp: July 31, 2024, 10:05:34 am
content: Quote from: Rooster Cogburn on July 31, 2024, 09:56:52 amIt´s a GX16-4 connector. You can find the pin-out and a lot more of info on the following page:https://github.com/ludwich66/RC3563/wiki

author: Rooster Cogburn
author_rank: Regular Contributor
timestamp: July 31, 2024, 12:54:32 pm
content: Great, thanks!What's your take on RC3563 vs YR1035+? I didn't research that too much, just saw a good deal on the 1035 and bought it mostly with the intention of using it to check my LiIon batteries.

author: pcprogrammer
author_rank: Super Contributor
timestamp: July 31, 2024, 01:04:15 pm
content: Quote from: Rooster Cogburn on July 31, 2024, 12:54:32 pmI did more or less the same. For what I could find the two do not differ that much in performance, and it was a bit cheaper. Also just bought it to measure liion batteries. Out of curiosity I also bought a Liitokala Lii-500 but the internal resistance measurement of the one I got is way of. Reports ~25mOhm for several batteries the YR1035 shows ~70mOhms for.I checked the YR1035 with a resistor I know the value of, based on other measurements, and it seems to be correct. (~120mOhms)But the Lii-500 can charge the batteries, where the YR1035 can't.

author: Rooster Cogburn
author_rank: Regular Contributor
timestamp: July 31, 2024, 01:57:58 pm
content: Good to hear. I'm quite happy with my purchase. The measurements for my batteries all seem to line up with what is stated in reviews, so at the very least that seems to work. Looks like I also got a real neat milliohm / ESR meter for free, just need to figure out the probe situation and do some voltage / current measurements.I don't think the internal resistance values out of any charger are going to be terribly useful. In my experience with a DMM measurements <1Ohm are not very reliable. If you got a 4 1/2 digits meter with nice sharp gold tipped probes and compensate for lead resistance maybe 0.1Ohm. But battery resistance is like <0.05Ohm, I don't see how any charger can measure that reliably with a 2-wire setup.

author: pcprogrammer
author_rank: Super Contributor
timestamp: July 31, 2024, 03:45:21 pm
content: If you look on youtube how people measure the internal resistance it is by loading the battery with a known resistance and then check the voltage drop when connected. Based on the known resistance the current can be calculated and with that the internal resistance of the battery. Only this is not the most accurate due to the discharge curve of a battery not being linear. That is why the YR1035 used AC to do the measurements.No idea how the Lii-500 does it's measurement. I also have a DL24 electronic load that calculates the internal resistance. It is not that great either, but with the aforementioned batteries it was closer to the YR1035's reading on start of discharge, but reads higher values near the end of the discharge.For matching batteries I will be using the YR1035 for the internal resistance aspect for sure. The capacity I can determine with either the Lii-500 or the DL24. Still have to compare the two though. Just got the tools a couple of weeks ago.

author: Rooster Cogburn
author_rank: Regular Contributor
timestamp: July 31, 2024, 04:16:43 pm
content: Thanks for the explanation, that makes a lot of sense. I was wondering how they could possibly measure resistances of a few milliohm otherwise.

author: isabido
author_rank: Contributor
timestamp: September 30, 2024, 08:09:18 pm
content: Hi Guys, I don't know if it's correct to add this to this post or better to open a new one.I have recently acquired a YR1035+ and after some verification tests comparing the voltages with my two FLUKES I have an error in the measurement that I don't know if it is due to the measurement procedure or a deviation of the YR1035+As you can see in this image my two FLUKE's measure exactly the same value, but the YR1035+ always gives lower readings.The error seems to be constant at about 0,033V.I have also tried with the tips (instead of the holder) with the same results. Do you think it is an error in the calibration of the YR, or is it due to the type of measurement at four Kelvin points.

author: Phil1977
author_rank: Frequent Contributor
timestamp: October 01, 2024, 03:13:58 am
content: This is a deviation of <1% of the value, and <0.25% of the range. I don't know the spec of your YR1035+ in detail but it still may be in tolerance.I often recommend these cheap devices to test internal resistances you couldn't measure with any other low priced instrument. But for voltage I would just trust the Fluke.Most of the resistance testers can be calibrated in their software, but I remember of my RC3536 that the linearity was bad. If I calibrated the 20V and the 100V range with its endpoint, then 20V in the 100V range was a few percent off. I wouldn't trust the voltage display too much.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: October 01, 2024, 05:00:37 am
content: I got the same offset vs DMM.3.83v vs 3.88v on a given 18650 cell.On a non Yaorea branded YR1030+ (Its the same as 1035+ only socket interface varies between them, "30+"= USB)

author: isabido
author_rank: Contributor
timestamp: October 01, 2024, 06:49:16 am
content: I asked my friend ChatGPT who knows everything what differences there could be between a measurement at 2 standard voltage points and one at 4 Kelvin points and he gave me this answer, I don't know if it's correct, but it could be part of the measured deviation.Quote

author: danno_cj
author_rank: Contributor
timestamp: October 01, 2024, 07:18:50 am
content: My Fluke 787 on one 18650 cell read 3.905V and Yaorea YR1035+ read 3.9062V. On 5s battery pack Fluke show 20.00V and YR1035+ give 20.001V. To me is more important the internal resistance because of this I bought Yaorea. Changing the spring probe with tweezer probe show exactly the same voltages.Later edit:I believe that you got a clone. My unit has Yaorea written with yellow on front and on the back side has a seal on one screw. Also the box has Yaorea name printed. I think the difference may come from lower precision parts or/and from calibration process. I didn't bought from official store but my unit seems to be original or at least a better clone.Not only western brands have issues with counterfeit goods but also Chinese brands. When official store is available on AliExpress is better to buy from there. If you want to save some bucks you may end to get a clone or old revision version when buying from others

author: isabido
author_rank: Contributor
timestamp: October 01, 2024, 11:44:00 am
content: When I get home I'll send you a detailed image, but I'm sure it's a clone.This was the link where I bought it:https://es.aliexpress.com/item/100500675611557751€ for the version with the battery holder.How much did your unit cost you? Do you have the purchase link?I found this purchase link that looks like original equipment from the buyers' photos.https://es.aliexpress.com/item/4000055332778.htmlWhat do you think?

author: danno_cj
author_rank: Contributor
timestamp: October 01, 2024, 04:53:46 pm
content: The listing page from the shop that I bought is not valid anymore. The price was 61 dollars but I paid 55 because I had a 6 USD coupon. I bought the version with both probes and battery holder. The last link that you have posted is from official store. The pictures submitted by buyers match with my unit, so from there you get genuine device.

author: isabido
author_rank: Contributor
timestamp: October 03, 2024, 07:00:25 am
content: I finally made the return and bought an "original" one, I hope! on this page.https://es.aliexpress.com/item/4000055332778.html

author: DaneLaw
author_rank: Frequent Contributor
timestamp: October 03, 2024, 11:58:54 am
content: Quote from: isabido on October 03, 2024, 07:00:25 amHere you can see a comparison, between* Yaorea 1035+* Non branded YR1035+* Fnirsi HRM10* RC3565Its a mixed bag across the field, the RC3565 seems to be able to go down to a decimal more, on its ohm.*Have removed the regional "es" from your aliexpress link, as it tends to mess up cookies - changes regional settings.

author: isabido
author_rank: Contributor
timestamp: October 10, 2024, 02:31:00 pm
content: Enigma solved! Fantastic seller. EVERYTHING ORIGINAL, nothing to do with the FAKE equipment that I received.Perfect precision.You can see the images.https://imgur.com/gallery/yaoera-original-MAxoJFB

author: al777
author_rank: Contributor
timestamp: October 13, 2024, 05:04:18 pm
content: Quote from: Phil1977 on July 30, 2024, 07:04:44 pmI decided to reply to this thread to keep it all in one spot - and to say thanks to Phil1977 for the idea!I also have the RC3563, love it and it has a permanent spot on my bench. My kit came with battery holder, pogo pin-based probes and the Kelvin clamps. All good, but not ideal for small parts or small test points on a PCB (in some cases I use PCB traces as small value shunts - need to measure those to ensure the fab didn't screw my calculations). I was getting by with the kit, always thinking that shorting the primary and sense lines ahead of the test point will introduce too much of an error and therefore would end up being wasted effort. But Phil1977's measurements made me try it.First I dug out from the pile all possible options for the tips. And to my surprise, the cheapest tips (free essentially) that came with one of the cheap multimeters were the best. They are from the kit which comes with various 4mm thread screw-in attachments. One of the attachments were just the short 2mm tips with 4mm thread on the other end. Not even sure what was their use - screwing them into the female thread "receptacle" makes an oddly short "multimeter probe" and the included actual multimeter probes do have 4mm thread on one end, but permanently attached 2mm probes on the other end, so these little tips were not even the replacement tips... The beauty was that when measured by the RC3563 (with Kelvin clamps, ~10 mm apart on the same tip), each of these tips gave <0.5 mOhm. I had to wipe them well with 99% IPA to get that though.Next, I looked around for what will be good to use as pen-style holders for these tips - and sure enough, Bic "Round Stick" pen (the worst writing instrument, but cannot be any cheaper) were perfectly accommodating the 4mm thread side, not as a thread-in, but as a very snug press-fit. With the back of the tips properly wetted with solder - they were ready to go. I chose Red and Grey pens to make them look more like actual probes.It worked out very well, with round trip resistance as measured by the RC3563 being just over 2mOhm. Thanks to 4-wire setup - I used light two-core red+black wires, thin, flexible and yet giving great result in the end.Of course I could not stop there - the odd GX16-4 connector comes as a pair, the plug (what I needed) and the receptacle (would be languishing in the odd parts bin forever). So my next move was to use the receptacle and make an adapter so that I can use the same newly created probes (and the RC3563 kit probes as well) with my bench multimeter, Siglent SDM3065X for 4-wire resistance measurements as well. So, with sacrifice of the 4 banana plugs and with upcycling of a couple of old PCBs cleaned of any parts - the adapter was created!Have a look at the pictures. The adapter looks a bit "steam-punk" style, but I like to reuse the material that otherwise would be wasted, so let's call it "stylish looking". And measurement with SDM3065 shows 6.8mOhm round trip, not bad at all.I hope this may inspire someone else to enhance their bench setup as well. Special thanks to Phil1977 as well as the community and the person who supports the RC3563 Wiki page!All the best to everyone!20241230 update: added a 3D printed enclosure to make it look less "steampunk-y" :-).

author: Phil1977
author_rank: Frequent Contributor
timestamp: October 13, 2024, 06:08:47 pm
content: Thanks for the nice feedback and great idea with the 4-wire adaptor for the bench multimeter!

author: Filippo52
author_rank: Regular Contributor
timestamp: December 01, 2024, 08:32:33 am
content: Good morning everyoneThanks for this thread full of information on the YR1035I have two yr1035+ one almost certainly original with the yellow writing and the internal component initials erased. The other one is definitely a clone with the internal component writings not erased.They seem very very similar.I wanted to try to do a calibrationThe original model has the calibration menu but it does not activate by pressing the button nothing happensIn the clone even though the same number 7 exists inside the menu there is not even the word calibration and only "---" appears.Does anyone know if there is a way to enter the calibration menu?I read that in the new versions the menu has been deactivated but since they have to do the calibration in the factory maybe there is a trick to get around the block.It would be very useful because the instrument has a very high resolution but given the price and the quality of the components used it is quite normal for there to be a drift with time of the component values ​​and a calibration would be very useful.Thanks in advanceFilippo

author: LarryR
author_rank: Contributor
timestamp: December 22, 2024, 03:30:08 pm
content: Hi Filippo,Would you be able to post internal photos of your yr1035+ clone that has the part numbers still on the ICs?My yr1035+stopped measuring voltage but still measures impedance and knowing the IC part numbers would help troubleshooting.I noticed that my unit uses a daughter board soldered to the main board. It has 2 MOSFETs on it.ThanksLarry

author: mawyatt
author_rank: Super Contributor
timestamp: January 16, 2025, 04:48:01 pm
content: Here's a use for the Battery Adapter that works quite well for larger SMD components. We used the YR1035 Battery Adapter to measure low Z SMD Resistors, 2512 in this case. The idea is to hold the SMD with tweezers while centering between the plungers, then slide the plunger to engage the SMD and continue to slide until the coaxial outer shell (carries current in 4 wire Kelvin technique).Keep the SMD held with the tweezers (parallel for max hold surface area) unless you like looking for small SMD parts on the floor, don't ask whyResults compared with our Split Kelvin LCR Meter fixture are quite good, even at 1mΩhttps://www.eevblog.com/forum/projects/different-type-lcr-smd-fixture/msg5658557/#msg5658557BTW we were intrigued by the Coaxial Probes by Yaoera similar to the old HP Milliohm Meter Probes and decided to develop a PCB based adapter for use with our DMMs like Phil1977 & al777 did earlier, will report results later when stuff arrives. The adapter should work with the test-leads/fixtures that utilize the GX12 used with the Fnirsi HRM-10 and XS10 used with the Yaoera type connectors. 4 Banana Plugs fit in the PCB holes that plug into the 4 Banana sockets on DMMs for 4 Wire Kelvin Connections.Anyway, if you want to participate PM us.Best

author: mawyatt
author_rank: Super Contributor
timestamp: January 17, 2025, 05:22:37 pm
content: This begs the question just how good is this YR1035 when measuring low value SMD resistors with the Battery Fixture compared to a Lab Grade LCR Meter with a "Proper" SMD fixture.So we set up our TH2830 Lab LCR Meter with the Split-Kelvin SMD Fixture mentioned here.https://www.eevblog.com/forum/projects/different-type-lcr-smd-fixture/msg5658557/#msg5658557Measurements were conducted at 1KHz to match the YR1035 measurement frequency and TH2830 Source was 30Ω @ 2V.From our notebook for 2512 SMD Resistors, values in (#) are from Tonghui TH2830.Edit: added results for AC and DCR from Hioki IM3536 Lab LCR Meter [ACR,DCR]How good is the YR1035, judge for yourself?Best

author: mawyatt
author_rank: Super Contributor
timestamp: January 18, 2025, 04:57:54 pm
content: Added Fnirsi HRM-10 measurements to above this morning. The supplied Battery Fixture couldn't be utilized since the sliding range doesn't go short enough to engage a small SMD device, so we resorted to the supplied Kelvin Clips.This proved difficult as we've experience before, so we clamped one of the Kelvin Clips to the bench and free up a hand to press the "Hold" function on the HRM-10 to capture the measurement while the other hand carefully held the other Kelvin Clip so little stress was placed on the DUT SMD Resistor. This worked but is somewhat tedious and one must be very careful not to damage the DUT which is being held between the 2 Kelvin Clip "Jaws".The HRM-10 measurements are shown on the right side as <#>.Anyway, how did the HRM-10 perform, judge for yourself!!BTW these meters, both Lab Bench types and Handheld "Battery Tester" types, can delivery large currents to the DUT (sometimes >100ma) which enhances low Z measurements, something typical tweezers can't do since they are "battery limited" and the Kelvin "Sense" is not at the DUT junction but recessed in the tweezer tip.Best

author: mawyatt
author_rank: Super Contributor
timestamp: January 31, 2025, 04:54:13 am
content: Quote from: mawyatt on January 16, 2025, 04:48:01 pmPCBs arrived today so we slapped together a couple adapters for the YR1035 type and HRM-10 type connectors using some cheap AliX connectors. These adapters allow one to use the various Kelvin Clips and Fixtures for these low cost meters. We particularly like the Yaorea Coaxial Kelvin Probes and wanted to have those for use with our DMMs and developed the adapter as previously mentioned.Quick assessment demonstrated this adapter works quite well with the YR1035 and HRM-10 accessories.Edit: Just noted the image below showing theYR1025+adapter to the DMM should readYR1035+Best

author: Maximus Panin
author_rank: Contributor
timestamp: July 22, 2025, 04:45:24 pm
content: Quote from: Rooster Cogburn on July 30, 2024, 03:14:45 pmAnswer on the manufacturer's website:Quote from: YAOREAQuote from: Rooster Cogburn on July 30, 2024, 03:14:45 pm'BU' - When measuring sources over 30V, this will help avoid sparking.'CR' - Contrast display.Question: what is displayed on the screen when you turn on 1035 or 1035+ ? I saw reviews with screenshots somewhere and they displayed 1035+

author: danno_cj
author_rank: Contributor
timestamp: July 22, 2025, 11:40:42 pm
content: On my unit YR1035+ when turning on the screen show YR1035 with some Chinese characters and the version number: 2.2206

author: Songhua
author_rank: Contributor
timestamp: August 05, 2025, 11:38:56 pm
content: Thanks for sharing. I recently purchased the original YR1035+ directly from original shop.The voltage is only +/-0.0001V comparing to a brand new Fluke 289 multimeter. I think the new YR1035+ is recently calibrated out of factory. But the firmware doesn't have calibration option. Firmware version:Ver2.KSMYWhen I shorted the Kelvin Clips, the internal resistance reading was 00.02 m Ohm, sometimes 00.04 m Ohm. Even thought the latest firmware doesn't haveZerooption, the internal resistance reading is acceptable.

author: Tantratron
author_rank: Frequent Contributor
timestamp: September 12, 2025, 05:06:46 pm
content: This thread was mentioned to me through another thread and member related to my repair of an eBike lithium-ion battery pack. So far, I purchased alow cost battery charger-testerwhich does estimate the ESR of each cell but some member do question the ESR results.After I read this thread, I'm not sure to understand if we can use a 4 wire kelvin method pure ohmeter to directly estimate the ESR of a 18650 cell or will it dangerous...I do have in my lab for many years a 4 wire kelvin ohmeter purchased from germany which seems quite good but can I use it measure the ESR of a Lithium Cell ?This isthe modelwhich I operate for many yearsThank you, Albert

author: shabaz
author_rank: Frequent Contributor
timestamp: September 12, 2025, 07:45:43 pm
content: Quote from: Tantratron on September 12, 2025, 05:06:46 pmHi,If by pure ohmmeter you mean can you take any arbitrary milliohmmeter (4-wire or not) and connect it to a battery, the answer is no.It needs to specifically be one that:(a) uses an AC measurement method (not all arbitrary milliohm meters will do that) and(b) uses 4-wire measurement, and(c) is designed to work in the presence of a voltage at the terminalsIf the meter mentions it is for battery testing, then usually all the above items will be satisfied.The instrument mentioned in the title thread (YR1035+) is an example of one that meets those requirements. The model you link to, I have no idea, but there's a fair chance the answer would be no.I have the YR1035+, and FNIRSI HRM-10, both seem to give plausible results extremely close to each other, and very much in the right ballpark. I've never checked against a higher-end instrument (I have one, but time is short, I'll get around to it at some point).In practise, the actual value is not always the most important thing (it depends on your use-case). For instance, you may want to look at a known good cell, and then make a record of values and then compare them to others of the same model or batch. In that case, you may just care that the measurement is repeatable, and the actual error might not be as critical.So, personally I don't have any suggestion/recommendation between these particular two instruments to give you, but can state some simple differences between the two instruments.YR1035+Old-fashioned Micro USB charging. Power-off is fiddly (requires a few button presses). The connector isn't as popular as the one on the HRM-10 I feel (I could be wrong), but it feels fine. It's a circular push-on locking connector.HRM-10:Color display, but not a top quality IPS screen or anything. Very simple to power on/off. USB-C charging. Physically slightly longer in length compared to the YR1035+. The connector is like a low-cost so-called "aviation" style circular connector (from memory, more like an old-school CB-mic connector!) that is pushed then screwed on.With both instruments, I like you don't really need to do any configuration. Just power it on and you're good to take a measurement.With either instrument, one would want a test jig, because using handheld probes will get tiresome fast. There are cheap test jigs on AliExpress for cylinder style batteries (spring-adjustable to accommodate 18650) but I've not tried them (I made my own).

author: danno_cj
author_rank: Contributor
timestamp: September 12, 2025, 08:40:08 pm
content: You can't. Milliohm Meter use DC signal to test and battery internal resistance tester use AC signal. Take care because the battery voltage can broke the Milliohm Meter. Yaorea device discussed on this thread tolerate battery up to 100V.

author: Tantratron
author_rank: Frequent Contributor
timestamp: September 13, 2025, 06:21:30 am
content: Thank you@shabazfor these detailled explanation (only AC measurement) and comparison of 2 brands.

author: bateau020
author_rank: Frequent Contributor
timestamp: September 13, 2025, 05:22:06 pm
content: To add a bit more: "ESR" is a generic term. The YR1035+, like many others, uses 1kHz AC.Most entry level battery chargers use a DC method: put a known DC load on the battery, and measure the voltage drop compared to the situation without the load. The MC3000 uses that for example.These measurements are not comparable, as the impedance of a battery is much more complex that simply a resistor. See the attached image.The different components of that complex impedance can not only tell you things like age of the battery, but also its safety. To measure that, the serious tools use EIS (spectrometry) or time domain measurements with rather complicated signal analysis.

author: Tantratron
author_rank: Frequent Contributor
timestamp: September 14, 2025, 06:35:40 am
content: Bonjour@bateau020,I see we're both french, maybe we do not live far from each other then I noticed another post on EEblog from you (2023) whereyou have designed your own battery tester plus provide some mathematical modelling.My background is radio engineering and digital software radio so I understand a bit your approach to AC identify the transfer function. But does your simple model applies to battery cell (i.e. 18650) or can be generalized to a pack of cells ?Another question regarding my Extech 380193 LCR meter, do you know if it could be used to estimate roughly the ESR of a single 18650 lithium-ion cell. I ask because this LCR meter measures passive components via AC method (either 120 Hz or 1 KHz) ?I still miss any theory of battery testing, maybe there are some tutorials, how do you solve the issue the battery has DC voltage output versus measuring via AC its internal tranfer impedance parameters... any guidance appreciated ?By the way, if we do not live far away, it would interesting to compare the ESR estimated bymy ow cost chinese charger/testerversus your protototype.Merci par avance, Albert

author: bateau020
author_rank: Frequent Contributor
timestamp: September 14, 2025, 07:47:19 pm
content: Quote from: Tantratron on September 14, 2025, 06:35:40 amWell, it is not really simple, because the values of most of the components depend on the state of charge (SoC) of the battery, and to make it more complicated, it contains a Warburg impedance. But simplified, yes, you can generalize, provided the cells are roughly at the same state of charge. Just take parallel/series configurations into account.Quote from: Tantratron on September 14, 2025, 06:35:40 amYou could. One big warning though: use a DC blocking capacitor in series with the battery. You don't want to blow up the LCR meter. Best is to use a large capacitor with low ESR (electrolytics can be OK).This is how you do it:* Select a capacitor with low ESR. Discharge the capacitor and then measure the ESR with your LCR meter.* Then put the capacitor in series with the battery (watch out for polarity if needed: + to +, or - to -)* Fully charge the capacitor by connecting the free pin of the battery to the free pin of the capacitor for a couple of seconds.* Now you can use the LCR meter to the measure the ESR battery/capacitor combination. Of that value, substract the ESR value of the capacitor alone, to get the ESR of the battery.* make sure to discharge the capacitor after you've done, to avoid problemsMost ESR (or AC-IR -- AC Internal Resistance) values that are published by battery manufacturers are for fully charged batteries, at 1kHz. 120Hz ESR values are more used for filter caps that are used in power supplies.Quote from: Tantratron on September 14, 2025, 06:35:40 amSure, can do, I'm up North.By the way, other nice article:https://www.keysight.com/blogs/en/tech/bench/2022/05/31/a-deeper-look-at-lithium-ion-cell-internal-resistance-measurements

author: shabaz
author_rank: Frequent Contributor
timestamp: September 15, 2025, 01:17:32 am
content: Incidentally, just noticed, one very useful feature that the FNIRSI model has, is logging capability (they call it Sorting+History, because they assume a different use-case than what is being proposed in the text below):It's a must to have something like that for deeper tests, unless one is prepared to sit for hours manually recording data.It would have been even better if the instrument supported (say) SCPI, but in the absence of that, the logging is at least a workaround.Note: I've not used it for a proper test, I've only briefly tried it.To use it, one needs to go into the "Sorting" mode, and have set up a test jig that can periodically connect the probe connections to the battery-under-test (in other words, as part of that, you'd probably need two double-pole relays for the four connections, and make them double-throw too, so that any test charge or test load can be removed while performing the measurement - this is just a high-level minimal description, in reality you would want to consider safety/failure scenarios etc).Each time the probes make contact with the battery in the sorting mode, after a second or so, it beeps, and the measurement is logged internally. The measurement is made available in a CSV file when the instrument is plugged into the PC.I don't know how much internal memory there is, but it can cope with at least 100 measurements (I tried that much), which of course would be easily sufficient for (say) more than one measurement per minute, if the battery was being charged or discharged at the mAH rating value just as an example.I can't figure out how to erase the log from within the instrument, so you'd have to either manually ignore earlier measurements (they are timestamped), or you could try what I did from a PC, which was to delete the file which actually corrupted the file system, and then I did "chkdsk D: /f" where the "D" needs to be changed to suit the drive letter seen when the instrument is plugged in. That got me back to a clean state, but there's no guarantee that's a good way, so I'm not going to attempt that again! : ) It would be better to get a proper answer from FNIRSI (if they respond), or at least buy a spare instrument before you try messing with the file system, if you're reliant on the instrument and don't wish to be left in a state where it's not working permanently. (Note: a device reset won't fix the file system).Anyway, long story short, that logging feature is usable, and at very low cost and just some effort making a test setup, would allow for quite powerful cell exploration possibility, new and over time, and comparison between cells.

author: Tantratron
author_rank: Frequent Contributor
timestamp: September 16, 2025, 02:36:40 pm
content: Quote from: bateau020 on September 14, 2025, 07:47:19 pmOk then not so sure i'll give a try with my LCR meter and big cap. I see the method theoretically but still wonder the issue of small signal voding the big charge voltage inside the 18650 cell.Quote from: bateau020 on September 14, 2025, 07:47:19 pmToo bad, my wife is from Dunkerque but we live South-West near Toulouse.Many thanks for this technological detailed article, it helps me grasp the different signal processing and excitation modes to identify partially internal parameters of a battery. Again i'm not sure to fully understand how or why one can void or neutralize the big internal voltage (big stored energy) of the 18650 cell when applying small AC as an exciter. When doing identification parametric impedance, we go either small signal or big signal but this is always done AC or HF if the black box behaves AC or HF.What I still do not get, any battery wether Li-Ion or other technology is really equivalent to a very powerful electrolytic style, big DC capacitor. So why AC small excitation can actually enter or affect the big DC static voltage, aren't talking of 2 models (model DC and model AC)... something I still not get here or I totally miss the picture since these battery tester tools do work

author: bateau020
author_rank: Frequent Contributor
timestamp: September 16, 2025, 03:22:53 pm
content: For 1kHz AC ESR measurement purposes, it is easier to consider a battery as a voltage source with some circuitry (mainly a resistance) in series.The 1kHz AC ESR measurements are generally done using a couple of milliamps AC, to provoke a voltage ripple of a couple of millivolts on the poles of the battery.For Li-ion it is said to stay below 10mV ripple in order not to disturb the chemistry, that would provoke non linear effects.So not HF and not high power, and the DC is irrelevant to the ESR.Those ESR measurements are small signal AC, and the ESR part of tools like the YR1035+ is not much more than a dumbed down LCR meter with some large caps on the pins to block/ignore DC.

author: Tantratron
author_rank: Frequent Contributor
timestamp: September 17, 2025, 06:13:54 am
content: Thanks again@bateau020where after all, I learn now that the YR1035+ is kind of reinforced or slightly modified classic LCR meter.Since you read french, locally in Toulouse while going to a reconditioning local shop for mobile phone and laptop, I've met incenditally a young woman who made a Ph.D thesis about battery testing. She seems to have helped companies like VoltR (starup near Angers), no idea if her algorithms, modelling offers innovation.I'm postingthe LinkedIn post quoting her work, again no idea if her testing and modelling approach is innovative, expensive...If not possible to read the LinkedIn post, i'm copy-pasting the post -----------Nos appareils électroniques reposent sur un élément clé : la batterie.Et finalement, on ne connaît même pas sa vraie vie...🔋 Le client veut 1 chose simple : une batterie fiable, performante, qui dure.🪫 Pourtant, les seules infos disponibles se limitent souvent à la capacité et au nombre de cycles. 2 indicateurs… qui ne racontent pas toute l’histoire.Chez Seensys, nous sommes convaincus qu’il est temps d’aller plus loin.C’est pour cela que nous avons eu l’immense plaisir d’accueillir Roselyne JEANNE-BROU, docteure en électrochimie à l’Université Grenoble Alpes.Roselyne développe une technologie révolutionnaire capable de dresser un véritable “check-up” de la batterie :🔵 mesure d’impédance,🔵 résistance interne,🔵 paramètres électrochimiques avancés…Bref, une photo fidèle de l’état réel d’une batterie, bien plus pertinente qu’un simple pourcentage affiché à l’écran. Car une batterie “100%” restée des mois dans un placard n’a rien à voir avec une batterie “100% neuve” prête à être utilisée. Et à l’inverse, une batterie bien entretenue, même à 80-90%, peut parfois dépasser toutes les attentes.Ce travail ouvre la voie à :✅ une meilleure compréhension scientifique des batteries,✅ des diagnostics plus précis,✅ une meilleure certification de leur état,✅ et, in fine, une meilleure expérience pour l’utilisateur (moins de pannes, moins de SAV).Ces dispositifs n'existent pas aujourd'hui, et il faut pouvoir les adapter pour qu'ils correspondent au mieux aux modèles d'appareils actuels.Pour cela, Roselyne est venue renforcer ses compétences en microsoudure à nos côtés et avec Gaël, électronicien chez The Repair Academy, pour connecter cette recherche de pointe aux réalités techniques du terrain.Un grand merci à elle pour cette rencontre, nous avons hâte de contribuer ensemble au développement de ce projet ambitieux qui pourrait bien redéfinir la manière dont on évalue nos batteries !

author: bateau020
author_rank: Frequent Contributor
timestamp: September 17, 2025, 06:58:54 am
content: There is indeed a lot of work being done on batteries (ex: EV batteries, and solar energy storage), and the knowledge obtained merits diffusion. Chargers of large battery packs are much more complicated than the average charger of single 16850 cells. They not only do charge levelling, but also measure important characteristics of the cells under operation. The trick is to be able to do those measurements while the batteries are in use (either charging or being discharged). And the better methods take a LOT of time, as some of the most interesting measurements should theoretically be done in the sub-milli-hertz range. Hence: time domain methods are often used, as obtaining the results can be much faster.By the way, I witnessed a PhD dissertation not too long ago cell physiology and cancer research, where they were doing measurements on cell membranes of potentially cancerous cells. They had the same interrogations as I see with batteries: refining the model, and refining measurement methods: frequency domain versus time domain. Funny how these subjects seem universal.

author: Tantratron
author_rank: Frequent Contributor
timestamp: September 17, 2025, 07:53:38 am
content: Quote from: bateau020 on September 17, 2025, 06:58:54 amI happen to own a Toyota Camry hybrid car where Toyota motor company requires to do remote hybrid battery health check once per year to provide 10 year warranty.Lately i've repaired my wife's eBike battery pack (10S5P) which is why I got suddenly interested behind these Lithium battery test, charge, BMS...It seems then the real topic to properly assess battery health wether individual cells or battery banks could be only done on the fly or live via an advanced BMS (sensor, sofwtare). I assume for example Toyota hybrid BMS does log many information of each celle or bank which can be downloaded later by ODB protocol. However low cost BMS as found on my eBike has not such intelligence neither probes where cost is the leading decision. Which leaves the tradeoff cost, time of how to separate test one cell or one parallel bank after removing or deconstructing a battery pack versus live test real condition health monitoring and bad cell identification.By the way, no idea why Toyota preferred hybrid battery packed Ni-MH instead Li-Ion on high end models, is it safer, does it last longer... some of their models (i.e. Corolla Hybrid) do use Li-Ion but Camry hybrid goes Ni-MH as well as Lexus hybrid models.