There are a few things you can do to stop your car alarm from draining your battery. First, make sure that the car alarm is off. Second, make sure that the car is in a safe place and not in use. Third, try to keep your car’s battery charged as much as possible. fourth, try to disable any unnecessary features on your car’s alarm system. Finally, be careful when using your car’s headlights or other lights as they may cause the battery to drain even more quickly.