Sigh.
I had a good Li-ion spare cell that I kept in the refrigerator for safekeeping. It was charged to about 50% before storage and AFAIK it does not have protection - the phone handles the battery gauge.
A few years later I decide to inspect the cold storage Li-ion cells I have. This cell shorted while in the refrigerator... the only one of the 10-15 I have in cold storage! And this particular cell I was hoping to preserve (among a few, there are a bunch there that I didn't care for if they died but kept there anyway.)
The battery developed a fairly horrendous current leak and won't hold charge anymore (I tried charging at 4 amperes, it holds voltage for a little while but I could see the voltage going down on a 19999 count DMM). I just find it odd, as it didn't have a protection circuit, how did it die, it held charge just fine when I put it in cold storage.
Keeping spares is probably not a good idea as Li-ion is perishable, but if I just so happen to have a spare, it's the best I could do to keep it as good as possible...but what else could be done to prevent this -- or is it just inevitable?
I had a good Li-ion spare cell that I kept in the refrigerator for safekeeping. It was charged to about 50% before storage and AFAIK it does not have protection - the phone handles the battery gauge.
A few years later I decide to inspect the cold storage Li-ion cells I have. This cell shorted while in the refrigerator... the only one of the 10-15 I have in cold storage! And this particular cell I was hoping to preserve (among a few, there are a bunch there that I didn't care for if they died but kept there anyway.)
The battery developed a fairly horrendous current leak and won't hold charge anymore (I tried charging at 4 amperes, it holds voltage for a little while but I could see the voltage going down on a 19999 count DMM). I just find it odd, as it didn't have a protection circuit, how did it die, it held charge just fine when I put it in cold storage.
Keeping spares is probably not a good idea as Li-ion is perishable, but if I just so happen to have a spare, it's the best I could do to keep it as good as possible...but what else could be done to prevent this -- or is it just inevitable?
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