did i damage my new 18650 li-ion battery?

[xchcui]

helloi bought a new 18650 li-ion battery,and while i was checking the voltage of the battery with DMM(one probe pin to the + the other to the -),i noticed that one plug was on the common terminal,but the red plug was on the 10A terminal,instead of the voltage terminal. but i notices that,only after a few second and after 3 attemps,each one about 6 seconds,because the DMM didn't gave me any result,and i thought that the probe pin doesn't touch good on the battery - or +.so,i,apparently,made battery-short for those seconds by mistake.did i damage the battery?did i reduce the battery life?i will appreciate for your answerbest regards

 

[AnAppleSnail]

Ten amps for a few seconds is probably not going to kill the battery. What's the voltage now? You may have cut its protection circuit off, and putting it in a charger for a bit will reset that.

 

[oKtosiTe]

Sounds like the protection got tripped. If your charger is an i4/i2 or similar, it will not reset the protection (not true, read below), but HKJ's famous hotwire action should:
(Edit: only do this for a few seconds at most!)

(This assumes you still have one working, charged Li-ion battery.)

 

[xchcui]

thanks for your replies.

after i noticed my mistake i could ,immediately,measure the voltage, it was 3.77v.
when the protection cut-off the circuit,does it take time untill i can measure the voltage again?i mean untill the circuit close again or the battery returns to action immediately?(because as i said i could measure the voltage immediately)
i believe ten amp for a few second wont kill my battery,but my DMM doesn't have fuse on the 10A,only on the mA
terminal,and it was a short current,so aren't we talking about much higher current that pass through the battery?and even if the protection cut off,doesn't those high current for a short time reduce battery life?or thanks to the protection the battery will be same as before:thinking:?

 

[AnAppleSnail]

Unless you have a very nice multimeter, there's going to be almost half an ohm of resistance in the leads and contacts. Since V=IR, then 8A is about the maximum I'd expect on a 'dead short' like that. Reset times depend on the circuit and the conditions it detects.

 

[aau007]

Whether protected battery or not, if you had done any damage to it, you would have seen big sparks or smoke or bad burning smell. If you had none of those, I would not worry too much about it. Charge up the battery, do a drain at 1C, 1/2C and 01.C to see what capacity you get out of it now. Stick around close to your charger while doing the aforementioned.

 

[xchcui]

i,really, did not take into account the resistance in the lead and contacts,so you are right, for half ohm resistance the max current will be 8A,indeed.
i,also,didn't see any sparks or smoke or burning smell,so i guess everything is fine.

thank you very much for your replies,and for alleviating my concern.

 

[uk_caver]

For what it's worth, on my meters (one mid-range, one very cheap) on their 20A/10A range they seem to have probe-to-probe resistances of 0.1-0.2Ohm, each according to the other meter's resistance measurement.

 

[scaru]

Sounds like the protection got tripped. If your charger is an i4/i2 or similar, it will not reset the protection, but HKJ's famous hotwire action should:
(Edit: only do this for a few seconds at most!)

(This assumes you still have one working, charged Li-ion battery.)

The I4 will reset protection circuits.

 

[oKtosiTe]

The I4 will reset protection circuits.

Below 0.74 volt the charger will report error (all 3 yellow leds are flashing), but a small current will flow (about 500uA), this is enough to reset a LiIon protection circuit.

You are correct. My bad. Good to know.

 

[xchcui]

by the way,should all the 18650 li-ion battery in generally and no matter which brand it is(but the kind that look like the one that we see on oKtosiTe post)has the expiration date or the date of production printed on it ?or some brands print the expiration date and some don't?
because i don't see any date on my battery,so how can i know if the battery is really new?:shrug:

 

[Shadowww]

18650's don't have any definite "expiration date".

 

[xchcui]

ok.they don't have definite"expiration date".that i can understand,because it depends on some factors(how i use the battery,how i charge the battery,how i store the battery and etc.)but what about the date of production,how can i know that i bought a battery that was made this 6 month and not before 2 years?

 

[wertzius]

AW: did i damage my new 18650 li-ion battery?

You can't know and it's not important provided they were stored properly and reached you with around 3.8 V.
(corrected)

 

[xchcui]

Re: AW: did i damage my new 18650 li-ion battery?

i read before that li-ion battery has shelf life of 10 years.on the battery is,also, written,that its shelf-life 10 years.so it is important if you got a "new" battery that was sitting on the shelf 9 years,isn't it?
and when you say "...reached you around 2.8V."do you mean not below 2.8V?and if i got the battery with around of 3.8V-3.9V,and not around 2.8V,what should it mean?

 

[wertzius]

AW: did i damage my new 18650 li-ion battery?

Sry i meant 3,7- 3.8V! 2.8V would be bad.
9 Years ago weren't any of the todays cells available. So you can't buy them today. Maybe 2 years is realistic.
You won't be able to use a single cell 7 years or so, because the cells will become less powerful everytime you charge them.

 

[xchcui]

Re: AW: did i damage my new 18650 li-ion battery?

i exaggerated on purpose when i said 9 years,because i tried to emphasize the situation that:if the shelf life is 10 years, it means that it has expiration(doesn't it?) and ,probably, means that every year that will pass the battery will degrade.so i want to be sure that i buy a really new one.how can i do that?does the only thing that i can do is to trust the seller?it is not make sense.

 

[wertzius]

Re: AW: did i damage my new 18650 li-ion battery?

Yes you have to trust the seller.
Or you have to buy batteries with new developed cells. Like the 3400mAh cells from Panasonic, they are available since 1 or 2 years.

 

[xchcui]

Re: AW: did i damage my new 18650 li-ion battery?

i hope in the future they will print the date of production on the li-ion batteries like every product in the world,because this date is designed to protect consumers from a situation of buying old products(in our case-batteries)while we have been told that they are new.of course we can tell the condition of the battery by making some measurement like the internal resistance,the voltage drop of the battery when load,the capacity(AH)of the battery on different currents(like aau007 suggested on #6 post)and etc.but we can find out if the battery is new,only after we have already bought it:shrug:.

thank you very much for your replies
best regards:thumbsup:

 

[Shadowww]

Re: AW: did i damage my new 18650 li-ion battery?

All industrial (unprotected) cells already have manufacturing date printed on them. There are instructions on how to decode datecodes for Panasonic, Sanyo, Samsung, and few other manufacturer's cells on the internet.