Never fully drain the battery, as it shortens battery life. So, real time will likely be only 30 to 40 minutes. So, the answer to the question “Will a power inverter drain my. The typical lifespan of an inverter battery ranges from 3 to 5 years, depending on various factors. An inverter battery serves as a backup power source during electrical outages, converting direct current (DC) stored in the battery into alternating current (AC) for home or industrial use. But, Electrent's lithium battery comfortable last for more than 10 years. Signs of a dying battery include a decrease in charge-holding capacity, unusual noises from the inverter, and physical changes such as bulging or swelling. This conversion, however, is not a perfectly efficient process and inherently causes a continuous.