One more tidbit...the optimal charge level to store a LiIon battery at for long term storage is around 40%. If, for example, you weren't going to use a laptop battery for several months, charge (or discharge) it down to 40% and remove it from the laptop. This minimizes the "chemical stress" that the cell has containing its charge, while also ensuring that it doesn't self-discharge down to the dangerous low levels.
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-Scott
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