how long can you store lipos charged?

[magudaman]

Actually it is really best to keep the cells (if storing) at 40%. Lithium Polymer has a bad calender degradation. This mean the higher the temperature and the higher the state of charge (SOC) the quicker you cells will permanently loose capacity and have their impedance grow (more voltage drop with current). Lifepo4 (A123 or similar) solve this problem by having more stable chemical composition and don't suffer from calender problems.