Originally Posted by
MrFatbooty
I also found out that lithium ion batteries apparently lose about 20% of their capacity per year when stored at room temperature. More if warmer, and it doesn't matter how much or little you use them.
yes and no. it depends on the quality level of the cells that was used to make the battery.
there are about 20 different grades. starting at A++ . anything above B grade will last wayyy longer. For example we have IBM original batteries from 3 years ago, which has been sitting on the shelf and 10/10 on average retained 98% of the capacity. IBM obviously specs out A grade cells.
For smaller batteries such as digital cameras and cell phones, it makes an even smaller difference between grades.
The only time you will lose 20% is if it is stored in elevated temperatures (100F) consistently for months at a time.