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Key Fob Replacement For Car Batteries Key fobs allow you to lock and unlock the doors of your vehicle without having to use a metal key. Some feature buttons that activate the trunk alarm or alarm and some are able to start your car too. These handy devices could have problems. If that happens, replacing them costs much more than cutting an old-fashioned key. Battery A key fob has a battery to power the electronic. A dead battery could stop the key fob from unlocking your car or activating an alarm when you use it to open the doors or trunk. Fortuna