How to Change a Garage Door Remote Battery (Without Losing the Code)

When a garage remote goes quiet, the battery is the first thing to suspect and the cheapest thing to fix. Knowing how to change a garage door remote battery takes about five minutes to learn and can save a call-out over what is often an inexpensive part. The steps are much the same across Merlin, B&D, ATA, Gliderol, Steel-Line and other remotes, although case designs and battery types differ between makes and models. Where yours varies, the label inside the case or the manual has the final word.

Which battery does a garage door remote take?

Garage door remotes run on two broad kinds of battery. Slim, modern handsets mostly use a flat 3-volt lithium coin cell: CR2032 is the most common, with CR2025 and CR2016 turning up in thinner cases, and a few remotes stack two coin cells together. Older and some longer-range remotes use a small cylindrical 12-volt battery, labelled A23 (also sold as 23A or MN21) or A27 (27A).

Cells that look alike are not always interchangeable. A CR2025 will drop into a CR2032 slot but is thinner and may not hold firm contact, and an A27 is noticeably slimmer than an A23. Match the code printed on the old battery rather than its appearance. If the old one is already gone, check the moulding inside the battery compartment or the remote's manual.

Most remote batteries last somewhere between one and three years, depending on the remote and how often it's pressed. The usual signs are a shrinking range, where you have to be closer to the door each week, an indicator light that is dim or doesn't come on, and needing two or three presses for one response.

How to change the battery, step by step

1. Read the code on the old battery before you buy, or take the remote to the shop with you.
2. Work over a table or a towel so a tiny screw or spring can't roll under the fridge.
3. Open the case: undo the screw, slide off the cover, or ease the two halves apart at the seam (see the next section).
4. Look at how the old battery sits before you remove it. On coin cells the flat face marked with a plus sign usually faces up; on cylinder types, the flat end normally sits against the spring.
5. Lift the old cell out with a fingernail or a plastic tool rather than levering a metal screwdriver across the contacts, then fit the new one the same way round, holding it by its edges.
6. Check that the rubber button pad and the circuit board are sitting back in their places, then close the case and refit the screw.
7. Test it. The indicator light should glow when you press a button, and the door should respond from your usual spot on the driveway.

Getting the case open without breaking it

Remote cases are put together in three main ways. Screw-back cases have one small cross-head screw, sometimes hidden under a sticker or behind the keyring loop. Slide covers push off along a groove with firm thumb pressure. Clip-together cases have a small notch at the seam, often beside the keyring hole, where a coin or plastic pry tool twists the halves apart.

With clip cases, work gently around the seam rather than forcing a single point. The clips get brittle with age, especially on remotes that have spent years in a hot car. If there's no obvious way in, look at the product photos or manual for your model before you start prying, because some cases only open from one end.

Do you need to reprogram the remote after changing the battery?

Almost never. Modern rolling-code remotes hold their identity in memory that keeps its contents without power, and older dip-switch remotes store their code in the switches themselves, so a battery swap leaves both untouched. If a remote stops working straight after a battery change, something in the change is the likely culprit: the cell upside down, a contact bent flat, the wrong battery, or the button pad not seated properly.

On some rolling-code systems, pressing the button many times while out of range can knock the remote out of step with the opener, and a few presses close to the motor will often bring it back. If it still won't talk to the opener, code it in again; our guide to programming a garage door remote covers the learn-button method most openers use.

Remote still not working with a new battery?

• Try the other remote or the wall button. If those work, the problem is in the handset you just opened.
• Watch the indicator light. No light with a fresh, correctly fitted battery points to a contact or circuit fault in the remote; a light but no response points towards the opener.
• Check for a holiday or lock mode on the wall console. Some openers have one, and while it's on, every remote is ignored.
• Make sure the opener has power: its courtesy light should work and the power point should be switched on.
• If only the range is short, look for new LED lights or phone chargers near the motor, which can interfere, and check the opener's aerial wire hasn't been tucked away or damaged.

Still stuck? The remote not working checklist runs through the wider causes, and if the opener itself seems confused, our walkthrough on resetting the opener and its remotes explains how to clear its memory and start fresh.

Button battery safety at home

Used cells shouldn't go in the household bin. Put tape over the terminals and drop them at a battery recycling point; many supermarkets and hardware stores have a B-cycle collection box near the entrance.

Wall buttons, keypads and the opener's own battery

Not every battery in the system lives in a handheld remote. Wireless wall buttons and keypads run on their own cells, usually behind a cover that slides or unclips, and the same match-the-code rule applies. The opener on the ceiling runs on mains power. If it has a backup battery, that is a larger rechargeable pack that keeps the door moving in a blackout and is replaced as a separate job, which our opener battery backup guide explains.

When a new battery isn't the fix in Perth

If you're in Perth and a fresh battery hasn't brought your remote back, the handset may be worn out or the opener's receiver may need attention. We can code a replacement handset to your opener on site, or trace the fault back to the motor if that's where it sits. Our garage door remote replacement service explains how that visit runs.

Product Safety Australia sets the mandatory safety standard for button batteries and the products that hold them, and B&D shows the battery type for each of its handsets on its remote controls support page.