> Podobno nie jest dobrzer przechowywać ja naładowane w 100%, ale źródła
> teraz nie pamiętam.

Podobno http://www.batteryuniversity.com/partone-19.htm
The recommended storage temperature for most batteries is 15°C (59°F). While
lead-acid batteries must always be kept at full charge, nickel and
lithium-based chemistries should be stored at 40% state-of-charge (SoC).
This level minimizes age-related capacity loss, yet keeps the battery in
operating condition even with some self-discharge.