Switch off electrics via keychain
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Simple idea, just add an on/off button for your keychain that is associated with your interior and headlights of your vehicle. How many times have you left the lights on and killed your battery, or been sitting in your house only to realize you left the lights on. I dont know if it's possible or not, but on that note, why not make a switch that enabled you to cut off any power the battery might be using while your car is off, just in case you forgot about something.