Lipo Storage Charge. The proper lipo storage voltage is 3.8v per cell. When charging, please make sure the surroundings is clean, without sundries around.
Think of it like the size of the gas tank in your car. Assuming that you are using typical lipo batteries that hold a full charge of 4.2 v per cell, then you should be targeting a storage voltage between 3.6 v to 3.8 v, corresponding to roughly 85% to 90% of the battery’s full capacity. The safest charge rate for most lipo batteries is 1c, or 1 x capacity of battery in amps.