10ah 18650 cells - Page 1
Forum section: electronics / general

author: p.larner
author_rank: Frequent Contributor
timestamp: October 18, 2023, 03:25:25 am
content: seen some 10000mah lithium ion 18650 calls on ali,anyone tried any?

author: beanflying
author_rank: Super Contributor
timestamp: October 18, 2023, 03:38:38 am
content: 1V @ 10,000 mAh if you are lucky and have a 100% efficient way of getting there.They have been pulling that same garbage with powerbanks for years. Work on the basis that there is always one more sucker to take their money from.

author: Shonky
author_rank: Frequent Contributor
timestamp: October 18, 2023, 03:47:56 am
content: Yep, no way these are a thing.If they were you'd be seeing them in many other places e.g. the typical 18V (and other voltage) tool packs.

author: Kean
author_rank: Unknown
timestamp: October 18, 2023, 04:00:03 am
content: Total nonsense specification. The only way they could get that is based on step down to a lower voltage as mentioned by beanflying.From what I've seen available from reputable Li-Ion suppliers right now.18650 max out at about 3500mAh per cell26650 max out at about 5500mAh (maybe 6000) per cellBatteries capacities based on mAh are often useless. Even a Wh rating is useless if you don't know the test conditions, but at least the numbers still make sense for series/parallel packs (if done properly).

author: Whales
author_rank: Super Contributor
timestamp: October 18, 2023, 04:51:21 am
content: The 10Ah is completely false. I don't think you can even get 4Ah, the highest I've seen is around 3.2 or 3.5 or so.EDIT: I tried finding sources for these photos on tineye, but some of them have lost hosting over the years. They're not mine.

author: Haenk
author_rank: Super Contributor
timestamp: October 18, 2023, 11:43:36 am
content: Impressive, how much effort they put into faking these cells. Certainly 10/10 for effort.

author: Whales
author_rank: Super Contributor
timestamp: October 18, 2023, 01:32:41 pm
content: They're not always fakes like those photos. Some are second hand cells that (perhaps) might have once had a higher capacity, but are now worn out. I've read about people buying batches of 18650's where each cell's metal case and insulator all look different, but the same heatshrink has been applied, so they're just random 2nd hand cells that have been reskinned. There is no shortage of those and it's probably (?) more profitable to re-use this way than dismantle and recycle materials.

author: Dan123456
author_rank: Regular Contributor
timestamp: October 18, 2023, 02:32:40 pm
content: Quote from: Whales on October 18, 2023, 04:51:21 amLolI figured they would just relabel shitty cells… not take the time and effort to put a battery in a batteryI actually have one of those 3000mAh Ultrafire batteries that came in one of those cheap “high power” laser pointersI knew it was sus and nowhere near 3000mAh but am definitely gonna have to pull it apart once it dies (I’m sure that won’t be too long) to see if it looks the same on the inside

author: p.larner
author_rank: Frequent Contributor
timestamp: October 18, 2023, 04:47:10 pm
content: I had exactly the same laser pointer 3ah 18650 cell,after a year of little use it tested at 65mah on my litokala li-500 tester so when new guess it was possibly 800mah!,the bar stuards!

author: AndyBeez
author_rank: Frequent Contributor
timestamp: October 18, 2023, 05:13:45 pm
content: These cells are rather dangerous when it comes to charging them as they clearly 'under rated and over stated'.A question for Joe or Jocelyn Public. What capacity charger can you use to charge a 1000000Ah lantern cell? Correct, the BIGGEST one they sell on Amazon.And how many milliamp hours will the battery take before emitting the white smoke of doom? Correct, none.

author: wraper
author_rank: Unknown
timestamp: October 18, 2023, 05:22:03 pm
content: You'd be lucky if they ship used cells in semi-decent condition. But most likely you'll get total garbage with about 0.5-0.7Ah capacity.

author: Whales
author_rank: Super Contributor
timestamp: October 18, 2023, 09:58:55 pm
content: Quote from: p.larner on October 18, 2023, 04:47:10 pmDon't charge that at too high of C rate

author: Zenith
author_rank: Frequent Contributor
timestamp: October 19, 2023, 01:48:10 pm
content: There are three first league manufacturers, LG, Samsung and Panasonic/Sanyo. Last time I looked, the highest capacity 18650 any of them made was 3,600 mAh, and they weren't easy to find. They all make 3,500 mAh 18650s.You can take claims of anything over 3,600 mAh, as nonsense.From what I've seen, the supposed 9,900 mAh cells are recovered from old laptop battery packs and relabeled. You'd be lucky to find they had a 1,000 mAh capacity - most can't manage that.There are a few Youtube videos on this.

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 20, 2023, 06:57:56 pm
content: Quote from: wraper on October 18, 2023, 05:22:03 pmYep that'll be about it.

author: amyk
author_rank: Super Contributor
timestamp: October 21, 2023, 01:36:35 am
content: Some of these ridiculously high advertised capacity cells are not used but actually newly made low-capacity cells with a deficit of material inside.https://lygte-info.dk/info/batteryDisassemblyUltraFire%20UK.html

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 21, 2023, 01:57:17 am
content: Quote from: amyk on October 21, 2023, 01:36:35 amThanks for the article. These Ultrafire batteries are pretty common, so interesting to see. I do have a few of them.And yes they never met their rated capacity, now we can see why (and I mean the 3000mAh kind here, so something that looked actually plausible).

author: luudee
author_rank: Frequent Contributor
timestamp: October 21, 2023, 02:29:42 am
content: This is an excellent site, for everything and anything about batteries (and fakes):https://batteryuniversity.com/Cheers,rudi

author: Whales
author_rank: Super Contributor
timestamp: October 21, 2023, 07:03:16 am
content: Quote from: SiliconWizard on October 21, 2023, 01:57:17 am

author: AVGresponding
author_rank: Super Contributor
timestamp: October 21, 2023, 07:46:20 am
content: Quote from: Whales on October 21, 2023, 07:03:16 amMust have had cider and a curry the night before, like me!

author: AndyBeez
author_rank: Frequent Contributor
timestamp: October 22, 2023, 10:54:23 pm
content: So what happens when you apply a mechanical compressive force to a 18650 cell?This is possibly the most sobering video on YT this week. Seriously, if you own any single or combi 18650 cells, you need to watch this.Crushing Huge Lithium Ion Batteries with Hydraulic Presshttps://youtu.be/t1j9TUV5coc?si=ZeymbqYkkbgNYEnM

author: Whales
author_rank: Super Contributor
timestamp: October 22, 2023, 11:54:23 pm
content: Common beginners error, they should be using plastic press heads so they don't short the battery during measurement.

author: Ben321
author_rank: Frequent Contributor
timestamp: October 23, 2023, 04:32:33 am
content: Quote from: beanflying on October 18, 2023, 03:38:38 amclaims of 2 million mA hours are fake, but 10000 mA hours isn't unexpected for a modern lithium ion battery.

author: Kean
author_rank: Unknown
timestamp: October 23, 2023, 07:02:52 am
content: Quote from: Ben321 on October 23, 2023, 04:32:33 amBe careful about mixing up the term battery with cell. This topic is about 18650 cells. No single commonly available 18650 cell right now will be more than about 3500 mAh as mentioned above.A battery (pack) with several 18650 cells in parallel can certainly reach 10000 mAh. In fact there is no reason a pack cannot reach 2 million mAh if you paralleled about 600 cells, but that would be an expensive solution.

author: Ben321
author_rank: Frequent Contributor
timestamp: October 24, 2023, 09:55:35 pm
content: Quote from: Kean on October 23, 2023, 07:02:52 amSorry. I meant a single cell.

author: miegapele
author_rank: Contributor
timestamp: January 14, 2024, 06:17:09 pm
content: Only 10Ah? that's amateurish. I have been using 99,000 mAh 18650 batteries with my 12,000,000 lumen flashlight and it works very good.

author: Whales
author_rank: Super Contributor
timestamp: January 15, 2024, 05:43:27 am
content: Inflation is spiralling out of control. We need to re-issue batteries with new units like kmAh to make them convenient again.

author: hfleming
author_rank: Regular Contributor
timestamp: April 16, 2024, 10:16:04 am
content: Quote from: p.larner on October 18, 2023, 03:25:25 amYeah, to my shame I drunk-ordered 4 of those 10000mA/h cells out of curiosity. They weigh 22g, whilst my 2200mA/h cells weigh around 48g. From fully charged (4.2V) to empty (2.8V) at 100mA discharge rate, I measured them to be 350mA/h!!!!

author: Rick Law
author_rank: Super Contributor
timestamp: April 25, 2024, 03:13:48 am
content: It is a shame that the fake market makes shopping for "real" 18650 cells practically impossible. The 18650's are so convenient for small flash light and little electronic gadgets that one can cook up.With the more modern (slim) laptops, they already moved away from using 18650's. So even the re-packed/re-skined battery market will have a sourcing problem. I suppose consumer 18650 market is or will be a thing of the past.

author: xvr
author_rank: Frequent Contributor
timestamp: April 25, 2024, 01:13:47 pm
content: 99% of batteries on Ali are a fakeUse another supplier (https://hobbyking.com/en_usfor example)

author: SiliconWizard
author_rank: Super Contributor
timestamp: April 25, 2024, 08:09:00 pm
content: Quote from: hfleming on April 16, 2024, 10:16:04 amYes.

author: Zenith
author_rank: Frequent Contributor
timestamp: April 26, 2024, 01:50:21 pm
content: Quote from: Rick Law on April 25, 2024, 03:13:48 amIn the UK there are several battery suppliers with eshops, which look to sell genuine 18650s and other Li-ion cells by major makers. Prices range from £4 to £8 depending on what you want. They seem to be long term businesses, not fly-by-nights selling a load of rubbish and legging it. There must be similar on-line stores in the USA.There's a huge market for 18650s for vaping, which doesn't look like disappearing any time soon. Another source of good 18650 cells is your local vape shop, although they'll tend to be a particular type.

author: Kean
author_rank: Unknown
timestamp: April 28, 2024, 11:42:43 am
content: I bought 48 pcs of HG2 18650 from an AliExpress seller that were specified for 3000mAh down to 2.5V.I've only been test discharging them so far at 1A to 3.0V, and have been getting pretty consistent readings of 1800mAh.So not great, but certainly not as bad as some reports I've seen - and for the price I paid compared to local trustworthy suppliers I am happy.I will be assembling these into packs that go inside some 12V SLA shells for backup power application.Some of my other purchases of 18650 cells and packs in December/January never arrived, but AE did process refunds on those.

author: Zenith
author_rank: Frequent Contributor
timestamp: April 28, 2024, 09:00:26 pm
content: I bought half a dozen 18650 cells on AliExpress back in the day - 5 years or so back. They were quite cheap. The sellers had good feedback and they appeared to be, according to my charger/analyzer, perfectly good Panasonic 18650 cells. I'm still using them in flashlights.There were a few suppliers on ebay, who seemed to know what they were selling, and didn't sell 10,000 mAh obvious rubbish. They tested what they were selling and didn't sell tat. I believe ebay got the wind up over the dangers of Li-ion cells, which they they thought were all 18650s and stopped 18650s being sold on their site, although other Li-ion cells could be sold. I haven't looked recently.These days, if I wanted more, I'd enter "buy 18650 UK" into Google and pick a reputable looking supplier, of which there appear to be several. You can probably buy then from Farnell etc, in which case they are unlikely to be junk.

author: bastl_r
author_rank: Regular Contributor
timestamp: May 08, 2024, 05:35:16 pm
content: HiBuy from nkon.nl if you can.Always good stuff. No crap.

author: Rick Law
author_rank: Super Contributor
timestamp: June 23, 2024, 05:04:17 pm
content: I should think, sourcing manager at Costco should have enough knowledge about batteries to know that 10AH for a LiIon battery packis dubiouscould be dubious. Apparently they didn't. I can only hope by now they do.Now what good would a replacement do? Burn your new house down too?--------------------------------Below quoted from Article Published June 22, 2024 1:33pm EDT567,000 chargers sold at Costco recalled for fire riskOwners of the product should stop using it and contact myCharge for a replacementThree portable charger models that were sold exclusively at Costco are being recalled aftertwo house fires were blamed on the unit overheating.The United States Consumer Product Safety Commission announced the recall in a June 20, 2024, release.The recalled units are the "myCharge POWER HUB All-In-One 10,000mAh" chargers carrying the model numbers "AO10FK-A," "AO10FK-B," and "AO10FK-C," said the commission.Link to original article:https://www.foxbusiness.com/lifestyle/567000-chargers-sold-costco-recalled-fire-riskEdit:Changed "is dubious" to "could be dubious"Looking at the slim size packaging again (photo is the original article when scrolling down), there isn't room for a larger then typical cell phone size battery. But possibly they could have three squeezed in. Possibly, but would be very tight squeeze. So "could be dubious" instead of "is dubious".

author: tooki
author_rank: Super Contributor
timestamp: June 23, 2024, 05:09:06 pm
content: Quote from: bastl_r on May 08, 2024, 05:35:16 pmA good EU source for genuine lithium ion cells is Reichelt, based in Germany.

author: Refrigerator
author_rank: Super Contributor
timestamp: July 23, 2024, 06:32:18 am
content: Not to brag but I've actually held a genuine Ultrafire battery in my hands.Yes it had the protection board and yes it had the rated capacity.A true rarity, i'm sure, just like the TowerPro MG995 was back in the day.

author: pcprogrammer
author_rank: Super Contributor
timestamp: July 24, 2024, 05:36:12 am
content: Quote from: Kean on April 28, 2024, 11:42:43 amWhat spread in parameters can one expect when ordering a batch of the more reputable 18650 batteries from one of the places mentioned here? For instance these:https://www.nkon.nl/fr/sony-us18650vtc4-flat-top.htmlI understood that for assembling a battery pack it is important to match not only the capacity, but also the internal resistance and for this I wonder how many batteries one would need to get to get 20 matching batteries. The pack I need them for is made up of two cells in parallel and 10 of these in series.I also read that for a string in series the capacities need to match as much as possible, but for parallel this does not matter that much. Is this true?

author: AVGresponding
author_rank: Super Contributor
timestamp: July 24, 2024, 04:33:16 pm
content: Quote from: pcprogrammer on July 24, 2024, 05:36:12 amKind of, but bear in mind that if the capacities are very different, you need to limit the charge current to a friendly level for the lowest capacity cell

author: pcprogrammer
author_rank: Super Contributor
timestamp: July 24, 2024, 05:57:23 pm
content: Quote from: AVGresponding on July 24, 2024, 04:33:16 pmI read that too. This is just to make sure that if the other cell(s) go bust the charge current won't be to high to ruin the remaining cell.It is an interesting subject with the necessary pitfalls and you can't just go on what is on the internet. Someone told me that Liitokala batteries are reasonably good as long as you buy them from a reputable store. Bought six from here:https://nl.aliexpress.com/item/32805750680.htmlbut they seem to be fake or at least reclaimed. Capacities are no where near the VTC4 specifications.I got into this because an original Husqvarna battery pack is very expensive and with only two dead cells, repairing should be way cheaper, but with all the stuff I bought for playing with Liion cells a new pack would not have been that more expensive.Got a battery spot welder, an Atorch DL24 150W electronic load, two Liitokala chargers (Lii-500 and Lii-M4S), a YT1035+ resistance meter, two four wire battery holders and a bunch of other battery related stuff. But that is always handy for other projects.

author: wraper
author_rank: Unknown
timestamp: January 06, 2025, 01:33:05 am
content: Fixed their branding.

author: silly sausage
author_rank: Regular Contributor
timestamp: January 18, 2025, 11:13:59 pm
content: dont forget there chinese mah's, not the same as the rest of the world, the conversion formula is x=/3.254.