Eneloop cracking

[ico]

My sister just arrived from japan. The eneloop on the bottom was at her bag while the one on top remained in her room. She was in hokkaido for most of the time and the lowest it got there was -12 Degress Celcius. The only thing I can think of doing this is the temperature right?

The "white" cover was chipping off

This one looks like the wrapper/white stuff shrank

What may have caused this?

 

[subwoofer]

Any chance she had a bottle of nail varnish remover in her bag that leaked over it? Looks like something a soaking in acetone could have done.

 

[ico]

I don't think so since she just went there for 2 weeks and had no time for those stuff. She attended the Winter festival so she was outside most of the time.

I'll just ask her later if something spilled in her bag.

 

[4tified]

May have short-circuted with some metal objects too and gotten hot enought to melt the wrapper.

 

[ico]

She said she never got to use it and upon checking it still has 1.195V. I also remember the cell was about 1.42V when it came out of the charger. Does that mean no short circuiting happened?

 

[ico]

The temperature there was negative12 C. I don't think the cell over heated.

 

[Streamer]

She said she never got to use it and upon checking it still has 1.195V. I also remember the cell was about 1.42V when it came out of the charger. Does that mean no short circuiting happened?

To me, that means there was a discharge/short of some sort. Bet they got hot during a temporary short. Just my guess.

 

[4tified]

The temperature there was negative12 C. I don't think the cell over heated.

Well, maybe it did shrink then, but I've had battery's with plastic labels in sub-c temps too and nothing like this has ever happened. The voltage drop is what gets me, I think Streamer may be right.

 

[alpg88]

open circuit voltage doesn't mean much with nimh. 99.9% it got shorted and overheated, my guess something in the bag shorted the cell, like keys, or anything mettal.

 

[ClassicGOD]

I was in colder wether (-21C) for few hours, my light (EagleTac D25A Ti) got so cold that after I got home and took it out of my cargo pants pocket it froze to my skin and still the Eneloop inside was just fine.

According to Sanyo Eneloops are designed to be used even in -20C temps.

 

[ico]

I see. I knew it! the specs were up to -20. I was doubting a moment ago thinking maybe it was only up to -10 or 0.
I guess you guys are right, the battery short circuited.

R.I.P. my battery

 

[4tified]

I see. I knew it! the specs were up to -20. I was doubting a moment ago thinking maybe it was only up to -10 or 0.
I guess you guys are right, the battery short circuited.

R.I.P. my battery

Now you have justification to get some new Eneloop XXX 2500's. Not all is bad ;-)

 

[entercpf]

Maybe because of the nuclear winter in Japan?

 

[ico]

Now you have justification to get some new Eneloop XXX 2500's. Not all is bad ;-)

I think they are eneloop pro now. I don't like them as much as the eneloop.

BTW, at least my sister got me some new 1800cycles eneloops :)

 

[eh4]

the crispy eneloop on the left looks slightly bulged to me, I'll bet that if the crispy layer were removed it would be more apparent.

 

[Wrend]

Getting hot from a short sounds likely, like the others said. And the voltage is lower than a charged cell would be. They recover to about that voltage after being mostly depleted.

Nice that you got some of the "1800" cells. I have a friend in Japan I was thinking about asking to bring me some the next time she comes back to the US, but probably won't bother with it since I don't really need them anyway.

 

[chewy78]

I see. I knew it! the specs were up to -20.
R.I.P. my battery

or -4 degrees Fahrenheit.