2025-07-14 00:00:00 Find out how long your car battery or any direct current battery can last with our Battery Life Calculator! This simple but powerful application allows you to accurately estimate the operating time of your battery, taking into account the battery capacity in amp-hours (Ah), voltage (V), connected load in watts (W), and the efficiency of a DC/AC inverter. Main features: Accurate calculation: Enter the battery capacity in amp-hours (Ah), the battery voltage and the connected load (W), and get an accurate calculation of the duration in hours and minutes. Configurable Inverter Efficiency: Adjust the efficiency of the DC/AC inverter you are using (in percentage), from lower values ​​to high efficiency inverters.