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What battery does a car alarm remote use?
Most car alarm remotes take an A23 (12 V high-voltage alkaline battery). Some use A27 or CR2032 instead. Open the remote case and read the code on the old battery.
| Battery | How common | Size | Volts | Capacity |
|---|---|---|---|---|
| A23 | Most common | 10.3 mm × 28.5 mm | 12 V | ≈ 50 mAh |
| A27 | Also used | 8 mm × 28.2 mm | 12 V | ≈ 20 mAh |
| CR2032 | Also used | 20 mm × 3.2 mm | 3 V | ≈ 225 mAh |
Car Alarm Remote battery: what to know
- Aftermarket car alarm and remote-start fobs often use a 12 V A23 or A27.
- Many newer alarm remotes use a CR2032 coin cell instead.
- Factory key fobs are covered by make on our key fob pages.
How to check which battery your car alarm remote takes
Open the remote case and read the code on the old battery. Battery codes are printed on the flat face of coin and button cells and along the side of AA, AAA and 9V batteries. Match the code exactly: a cell that looks similar can be a different thickness or voltage; see the A23 page for safe swaps.
A23: An A23 is eight tiny 1.5 V button cells stacked in one shell.