Originally Posted by kuzo
Mr Black- I just want to clear this up, not disagreeing with anyone. Both linger and Rick Howart have said not to leave at full charge for extended periods. More like at 80%. I have 8 of these and I want to make sure I am treating them right in the winter. Can these two different takes on platinum/carbon storage be discussed more?
Kuzo - it's really not that much of a difference. When you store the cells fully charged, the cell tends to loose a little capacity over time...not a whole lot and nobody really notices. Maybe 5% over 6 months - I'm just guessing on the number. Your Nimh will lose more than 5% the second charge.
When you store the battery 50% charged, the capacity loss is less than if you store it at 100%.
If you store it almost all the way discharged, then there is the danger that the self discharge will cause the cell to go undervoltage and then you will get a HUGE loss in capacity and destroy the cell.
This only applies to the Kokam batteries. I've had other lower cost brands puff up with a 100% charge in a matter of weeks.