Remote Battery vs Backup Battery — Know the Difference
Powers the handheld remote or wireless keypad. Replace when the remote stops working or range shortens.
Type: CR2032 coin cell (most brands)
Lifespan: 1–2 years · Cost: $3–$8
Inside the motor unit on the ceiling. Powers the opener during a power outage. Replace when opener beeps or flashes.
Type: Brand-specific (see below)
Lifespan: 2–3 years · Cost: $20–$40
Quick Lookup — Which Battery Do You Need?
| Brand | Remote Battery | Backup Battery | Beeping = ? |
|---|---|---|---|
| LiftMaster | CR2032 | 485LM (backup models) | Backup battery dead |
| Chamberlain | CR2032 | 485LM equivalent | Backup battery dead |
| Genie | CR2032 (current) / 9V (older) | 34613R | Backup battery dead |
| Craftsman | CR2032 (current) / CR123A (older) | Same as LiftMaster equiv. | Backup battery dead |
LiftMaster Battery Replacement
Remote: Most LiftMaster remotes (893MAX, 891LM, 373LM) use a CR2032 coin cell. Pop the back panel, swap the battery, snap closed. Takes 30 seconds.
Backup battery: LiftMaster openers with backup (8550W, 8355W, 8550WLB) use the LiftMaster 485LM — a 12V sealed lead-acid pack that slides into a side compartment on the motor unit. The opener beeps every 30 seconds and flashes yellow when it needs replacement.
$6–$10
$25–$40
Genie Battery Replacement
Remote: Current Genie remotes (G1T, G3T, G5T) use CR2032. Older remotes may use a 9V — check the back panel.
Backup battery: Genie backup models use the Genie 34613R replacement battery. The opener shows a flashing red indicator light when replacement is due.
Why Is My Opener Beeping?
A garage door opener that beeps — especially every 30 seconds — is almost always signaling a low or dead backup battery. This is not a malfunction. Replace the backup battery (see your brand above) and the beeping stops. If the opener continues to beep after a fresh backup battery, there may be a different error code — check the opener's LED blink pattern against your model's manual.
How to Replace a Remote Battery (Any Brand)
- Find the seam on the back of the remote — some slide, some pop with a flathead screwdriver
- Note the orientation of the old battery (+ side up or down)
- Insert the new battery in the same orientation
- Snap or slide the cover closed and test
- If it still doesn't work after a fresh battery, try reprogramming it
Need to reprogram your remote after a battery swap? See our complete opener reset and programming guide →