The Frunk kits don't draw any power when not used. However, companies like Antigravity offer battery monitoring devices in which you can check the health of your 12V battery on your phone. I use one myself, since we're testing a 12V LiFePO4 drop-in replacement.My biggest concern is the power source that need to be connected to the battery directly, which will eat up the 12v battery constantly. Is there any other power source hook up location that has switched 12v?