Battery Capacity Converter: Ah to kWh Calculator for Different Voltages

Convert battery amp-hours to kilowatt-hours by multiplying capacity (Ah) by voltage (V) and dividing by 1000; add efficiency to find usable energy. Example: 400 Ah at 48 V stores 19.2 kWh; at 88 % efficiency you can draw 16.9 kWh. Global battery costs dropped 83 % between 2010 and 2020 (IEA, 2020).