Drone Battery Charge Calculator

Charge Time in this calculator comes from dividing capacity by a charge current that is itself defined as a multiple of that same capacity (the C-rating), so the capacity terms cancel out mathematically -- a 1C charge takes roughly the same fraction of an hour whether the battery is small or large. Battery Capacity does still directly determine Charge Current (in amps), Energy Capacity, and Effective Energy, where the pack's absolute size matters.

Real LiPo chargers use two phases: an initial constant-current phase that delivers most of the capacity quickly, followed by a slower constant-voltage "taper" phase as the pack approaches full charge, where current tapers down to avoid overcharging. The 1.3x multiplier is a rule-of-thumb adjustment added to a simple capacity/current estimate to roughly account for that slower taper phase, rather than assuming the whole charge happens at a constant rate.

Battery Health is calculated as a straight-line decline from 100% at zero charge cycles down to 0% at the battery's Max Rated Cycles -- essentially (1 - current cycles / max cycles) x 100. Real LiPo capacity fade is usually closer to flat for a while and then drops off faster as the pack approaches end-of-life, so this linear estimate is a simplified approximation, not a measured capacity test.

Long-term LiPo storage is commonly recommended at roughly 3.8-3.85V per cell -- well below the 4.2V full-charge voltage -- because storing at full charge accelerates capacity fade and increases swelling risk. This calculator simply multiplies whatever per-cell Storage Voltage you enter by the cell count to report the pack-level storage voltage; it does not calculate or validate that target for you, so entering a safe per-cell value is your responsibility.