Lipo battery's should not be stored at full charge. That damages them internally, driving up internal resistance such that they then do not give good power output or run-time.
The usual recc'd voltage for storage is 3.7 - 3.9v and equates to between 30 and 50% charge level.
Online you can find plenty of references to Lipo fuel table ....
Empty ..... 3.2v
20% ...... 3.75v
50% ....... 3.85v
Up to full for a standard lipo at 4.20v - or in the case of our DJI packs 4.35v
These voltages of course are per cell ..... so multiply by 4 to have total for the DJI pack.
I believe the default discharge point is 10 days on the DJI packs - in my view that is too long as damage is accumulative. I prefer a shorter period of ~3 days - so that full charge is not an issue.
I also regard the DJI storage voltage of 50 - 60% as on the high side of safe, preferring to drip it back to around 20 - 30% mark.
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