mWh (milliwatt-hour) measures energy capacity, calculated as voltage (V) multiplied by milliampere-hours (mAh). For lithium batteries (nominal 3.7V), 2600 mWh ≈ 702.7 mAh and 3200 mWh ≈ 864.9 mAh. Unlike mAh, mWh accounts for voltage… What Is the Difference Between 2600 mWh and 3200 mWh Lithium Batteries?