How to change the batteries on an ADT alarm

Your ADT alarm system has batteries located in the battery drawer in the back of the master keypad. If your system has remote wireless sensors, they also have batteries. The main alarm system uses either a 9-volt alkaline battery or six 1.5-volt alkaline batteries. The remote sensors use either a 9-volt alkaline battery or a 3-volt lithium battery. Like many security devices, the hardest part about changing ADT batteries is finding them.

Slide out the battery drawer, which is located behind the master keypad.

Remove the old batteries from the battery drawer.

Replace the batteries with identical types.

Carefully slide the battery drawer back into the master panel.

Squeeze and unsnap the wireless sensor cover.

Remove the old batteries.

Replace the batteries with identical types.

Snap the cover back onto the wireless sensor.

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