9V Batteries chart and curves / Is common Alkaline battery is better choice for… - Page 1
Forum section: electronics / general

author: 001
author_rank: Super Contributor
timestamp: November 03, 2017, 12:13:48 pm
content: Hi!This is another "DDM battery tread" and I found interesting links:On-line comparisionhttp://lygte-info.dk/review/batteries9V/Common9Vcomparator.phpandIdividual curveshttp://lygte-info.dk/review/batteries9V/Common9VIndividualTest%20UK.htmlI see what at low currents (aka DMM) common Alkaline battery far better then LiIon/NiMH accumulatorsIs it true? Is common Alkaline battery is better choice for 9V DMMs?

author: Nusa
author_rank: Super Contributor
timestamp: November 03, 2017, 01:50:52 pm
content: For that you have to define "better choice".Single-battery price?Battery availability?- Alkalines are pretty universal worldwide.Operating cost over time?Rechargability?- Eliminates non-rechargeable types.Operating time on one charge? (need to know the minimum operating voltage of meter to interpret curve)- Non-rechargeable lithium will win here.Something else?Some combination of the above?

author: 001
author_rank: Super Contributor
timestamp: November 03, 2017, 03:40:14 pm
content: Thanx fo quick answer. NusaSee my links abowe and note that alkalines operating timeat low current appsis longest, quiet, cheap (low cost per time, not energy)LiIon good for current loads/ but 9V LiIons have built in DC/DC converter. so hum is not good for measurment tool PSWhy some peoples on this forum steel trying to replace alcalines with others types?

author: ebclr
author_rank: Super Contributor
timestamp: November 03, 2017, 03:45:42 pm
content: Your 1st priority must be leakage safetyMultimeter consumes very low battery, but if a leak happens will destroy the meter

author: edavid
author_rank: Super Contributor
timestamp: November 03, 2017, 04:16:08 pm
content: Quote from: 001 on November 03, 2017, 03:40:14 pmThis is wrong. Only the USB rechargeable types have a DC-DC converter. The more common Li-ion 2 cell types are perfect for DMMs.Example:http://lygte-info.dk/review/batteries9V/Conrad%20energy%20LiIon%209V%20500mAh%20(Blue)%20UK.html"These batteries have more than double capacity compared to NiMH 9V batteries and are close to a alkaline battery at low load and this battery will maintain high capacity and voltage at high load."

author: 001
author_rank: Super Contributor
timestamp: November 03, 2017, 04:26:52 pm
content: What we have with LiOns?Big currents and fast charge8.5v7.4v only, price about 10 common alkalines, no froseIs it ok for DMM?But ebay prices tease me with soshinehttps://www.ebay.com/itm/Soshine-9V-6F22-650mAh-batterie-rechargeable-Li-ion/253208146299?hash=item3af461b17b:g:tRsAAOSwrwxZ4h6XBut… For my three DMMs i use three$1 alkaline batteries per year i.e.$3 per yearUPDATED: I`m so stupid. GP at my local store about $0.3 onlyhttps://www.auchan.ru/pokupki/jel-pit-gp-1sht1604-6f22-krona.htmlWhat advantage I miss?

author: edavid
author_rank: Super Contributor
timestamp: November 03, 2017, 04:53:11 pm
content: Quote from: 001 on November 03, 2017, 04:26:52 pmIt starts at 8.4V. It is certainly "OK for DMM".QuoteOn US eBay we can get EBL brand 600mAh Li-ion for about $3 each.If you only change the battery once a year, you probably don't need them. I usually have to change them more often.QuoteThat is carbon-zinc, not alkaline.QuoteLess chance of leakage.

author: 001
author_rank: Super Contributor
timestamp: November 03, 2017, 05:51:43 pm
content: Quote from: edavid on November 03, 2017, 04:53:11 pmIs it problem since 9v batteries are hermeticaly sealed?(All mess inside)

author: edavid
author_rank: Super Contributor
timestamp: November 03, 2017, 06:01:38 pm
content: Quote from: 001 on November 03, 2017, 05:51:43 pmThey are not sealed. The extra layer of packaging helps, but alkaline 9V batteries still leak sometimes.

author: Kleinstein
author_rank: Super Contributor
timestamp: November 03, 2017, 06:03:14 pm
content: Even brand name 9 V alkalines sometimes leak, but not often and usually only when left in the instrument even when dead for a long time. However the amount of fluid is often small, so the damage can be limited. I have not seen NiMH Cell leak, but similar made NiCd sometimes do.Whether rechargeable is worth it, depends on the usage. Standard NiMH tend to have too much leakage to be useful in a low current application. If you need to replace the batteries often (e.g. more than every 3 months) it might be worth the rechargeable.It depends on the meter, how well the operate with a lower voltage when the battery is near empty. Some are more picky than others. I know of some calculators the could not reliably work with NiMHs (AAA) because only worked down to about 1.25 V / cell. Similar things might happen in a DMM.

author: 001
author_rank: Super Contributor
timestamp: November 03, 2017, 07:07:52 pm
content: Thank You!I.e. what alcalines still good for DMMs?

author: Someone
author_rank: Super Contributor
timestamp: November 03, 2017, 10:44:15 pm
content: Quote from: 001 on November 03, 2017, 07:07:52 pmSkip over the alkaline cells and go straight for primary lithium batteries (now common as smoke alarm batteries), few people use their meter consistently enough to use much more than the self discharge of the batteries.

author: 001
author_rank: Super Contributor
timestamp: November 04, 2017, 06:00:11 pm
content: Quote from: Someone on November 03, 2017, 10:44:15 pmCan You say what concrete model is good? I hear that Li is flamehazardous

author: Someone
author_rank: Super Contributor
timestamp: November 04, 2017, 10:46:48 pm
content: Quote from: 001 on November 04, 2017, 06:00:11 pmAll the long shelf life lithium based 9V batteries appear to be "good", but its hard to know when you need 10 years to test them. Equally the Energiser 9V lithium batteries which have been around long enough to know they work as advertised, may have changed their construction or design since then.The fire hazard from a 9V lithium is not much different from any other battery, they don't have higher short circuit currents or anything that would make them more likely to cause a fire. But once burning they are much harder to extinguish.

author: 001
author_rank: Super Contributor
timestamp: November 05, 2017, 12:14:46 pm
content: And what about NiMH 9V rechargeable batteries?

author: Circlotron
author_rank: Super Contributor
timestamp: November 11, 2017, 09:40:41 pm
content: Quote from: Someone on November 03, 2017, 10:44:15 pmI would only use one in a good meter that has auto turn off. No fun forgetting to turn it off and wiping out your ten dollar battery in your ten dollar meter.

author: wnorcott
author_rank: Regular Contributor
timestamp: November 29, 2017, 12:52:48 am
content: I have had good luck so far with the EBL 600 mAh rechargeables they last a good long time. Using it in one of the $20 transistor testers, multimeters and a few other things. Very close in price now to 9V alkalines too so it's better for me to use the Li-ion.