If you are wondering whether it is bad for car batteries to use a power inverter, then your worry is totally feasible. In fact, people must be concerned while using a DC to AC power inverter as exhausting its usage may harm the car power battery to an extended level. But if you use the power inverter safely, then you can trust its utility for a more extended time. You must follow some rules while using the car power inverters like you must not use it when the temperature is high, do not use it for a longer period when the engine is not running, you must look out for suitable input voltage, and maintain other such conditions to prevent any harm.