Quote:
Originally Posted by Aleron Ives
We're not talking about overcharging here. Lithium-ion batteries don't like being fully charged or discharged, and keeping a battery at > 80% for long periods will cause the capacity to drop over time.
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I was forgetting that. Technically if there is no current drain and the ambient temperature is more than a certain amount you are 100% correct.
https://batteryuniversity.com/
Yes, long term storage at 30% to 75% is best. But that would be weeks of no use and a higher ambient temperature.
Though higher temperatures (not usually a problem in Ireland) age the cell fastest. Time and total cycles (i.e. 10 off 10% discharges = 1 cycle) als wear out the cell.
Also quality. Some last for over 10 years and some only 2 years.
The challenge with some things is opening the case. Similar enough battery/cell packs are usually available.
40 year old things designed for 500 mAH NiCd with replacement 2500 mAH NiMH cells do need the charger unplugged as the trickle current is too high, though the regular charge current may be lower than is possible.
There are only a few weeks a year here when the temperature would be high for a fully charged unused LiPoly.