There are 2 things to keep in mind for maximizing battery life:
1) Battery Charge for Storage
LiPos should never be stored with a full charge. The proper charge level to store a LiPo is under 50%.
2) Proper storage temperature to maximize battery life.
A battery creates power via chemical reaction. Heat speeds up the reaction and cold slows it down.
If you plan to have a longer break from flying, the best way to store a battery is in a fridge, inside a plastic zip top storage bags.
Permanent Capacity Loss versus Storage Condition
||40% Charge||100% Charge|
|0 °C (32 °F)||2% loss after 1 year
||6% loss after 1 year
25 °C (77 °F)
||4% loss after 1 year||20% loss after 1 year|
40 °C (104 °F)
||15% loss after 1 year||35% loss after 1 year
|60 °C (140 °F)||25% loss after 1 year||40% loss after 3 month|
Do keep in mind to never leave a pack fully charged or at room temperature for extended periods of time.
Take care of your batteries and they will last longer.