You can replace most watch batteries at home with a battery, a screwdriver, and a plastic tool — no jeweler needed

A dead watch battery costs $5 to $15 to replace at a jeweler, but the battery itself costs $2 to $8. If you own more than one watch, learning to do it yourself saves money fast. The job takes 10 to 15 minutes and requires only a few tools you probably already have: a small Phillips or flathead screwdriver, a plastic pry tool (or a butter knife), and the correct replacement battery.

The hardest part is finding out which battery your watch uses. Once you know that, the actual replacement is straightforward. Most watches fall into one of two categories: those with a screw-back case and those with a snap-off back. The method changes slightly depending on which type you have.

Key Takeaways

  • Watch batteries are labeled by a four-digit code like SR626 or LR44, and you must buy the exact match or the watch will not work properly.
  • Screw-back cases require a screwdriver to remove the back; snap-back cases pop off with a plastic pry tool or butter knife wedged into the seam.
  • The battery sits in a metal holder called a battery contact, and you lift it out with a plastic tool to avoid touching the battery itself with metal.
  • After inserting the new battery, test the watch before closing it to confirm the replacement worked.
  • If the watch still does not work after battery replacement, the problem is likely the contact points or the movement, not the battery.

Identify your watch battery type before you buy

The battery code is printed on the old battery itself or on the inside of the watch case. Open the case back and look for a number like SR626, LR44, 371, or 395. Write this number down — it is the only thing that matters when you buy a replacement.

If you cannot see the battery code, search online for your watch brand and model number. Most manufacturers list the battery type in the manual or on their website. You can also take a photo of the inside of the watch case and show it to a pharmacy or electronics store; staff there can often identify the battery from the size and shape.

Buy the battery from a pharmacy, electronics store, or online retailer. Do not guess at the size or type. A battery that looks similar but has a different code will not power your watch correctly or may damage the movement.

Remove the watch case back

Look at the back of your watch. If you see a groove or seam running around the edge, it is a snap-back case. If you see small notches or indentations, it is a screw-back case.

For a screw-back case: Use a small Phillips or flathead screwdriver to turn the screws counterclockwise. Most watch case backs have two to four screws. Remove them one at a time and set them in a small container so you do not lose them. Once all screws are out, gently pry the case back away from the watch body using a plastic tool or butter knife.

For a snap-back case: Wedge a plastic pry tool or butter knife into the seam between the case back and the watch body. Gently twist the tool to create a small gap, then work your way around the edge, lifting slightly as you go. The back will pop off. Do not use a metal screwdriver for this step — it can scratch the case or slip and damage the watch face.

Remove the old battery

Once the case is open, you will see the battery sitting in a metal holder. The battery is usually round and silver or gold in color. Do not touch it with your bare fingers if you can avoid it — oils from your skin can affect the battery's performance.

Use a plastic pry tool, wooden toothpick, or the edge of a plastic credit card to lift the battery out of its holder. Slide the tool under the edge of the battery and gently lift. If the battery is stuck, try lifting from a different angle. Once it is loose, remove it completely and set it aside.

Before you insert the new battery, look at the metal contact points inside the case. They should be clean and shiny. If they look dark, corroded, or dirty, wipe them gently with a dry cotton swab. Corrosion on the contacts is a common reason a watch stops working even after a new battery is installed.

Insert the new battery

Check the new battery to see which side is marked with a plus sign (+). This is the positive side and must face up toward the watch face. Slide the new battery into the holder with the positive side up, then press it down gently until it sits flat in the holder.

Do not force the battery. It should slide in smoothly and sit level with the metal contact points. If it does not fit easily, double-check that you have the correct battery type. A battery that is too large or too small will not sit properly.

Test the watch before closing it

Before you seal the case back on, hold the watch to your ear and listen for a ticking sound. If you hear it, the battery is working. You can also move the watch around to see if the second hand moves. If the watch is digital, press a button to see if the display lights up.

If the watch does not work, remove the battery and check that it is sitting flat in the holder with the positive side facing up. Wipe the contact points again with a clean, dry cotton swab. Reinsert the battery and test again. If it still does not work after a second attempt, the problem may be the contact points or the watch movement itself, not the battery.

Close the case back

For a screw-back case: Align the case back with the watch body and press it down gently. Insert the screws one at a time and turn them clockwise with a screwdriver. Tighten them snugly but do not over-tighten — you want them find but not so tight that you crack the case or strip the threads.

For a snap-back case: Align the case back with the watch body and press down firmly around the edges until you hear or feel a click. The back should sit flush with the case. If there is a visible gap, the back is not fully seated. Press down again until it clicks into place.

Frequently Asked Questions

What if I drop the battery and cannot find it?

Watch batteries are small and straightforward to lose. If you drop one, look on the floor and under nearby furniture with a flashlight. If you cannot find it, buy a replacement from a pharmacy or electronics store. The cost is low enough that replacing a lost battery is faster than searching for 30 minutes.

Can I use any battery that looks the same size?

No. The four-digit code on the battery matters more than the size. Two batteries can look identical but have different voltages or chemical compositions. Using the wrong battery can damage the watch movement or cause it to run fast or slow. Always match the code exactly.

Why does my watch still not work after I put in a new battery?

The most common cause is dirty contact points inside the case. Wipe them with a dry cotton swab and try again. If that does not work, the problem is likely the watch movement or the contact points themselves, which means the watch needs professional repair rather than just a battery replacement.

How long does a new watch battery last?

Most watch batteries last one to three years, depending on the watch type and how often you wear it. Quartz watches use less power than digital watches with backlights or alarms. If your watch stops working within a few months of battery replacement, the battery may be defective or the watch may have another problem.

Should I wear gloves when handling the battery?

Gloves are not necessary, but they help keep oils from your skin off the battery. If you do not have gloves, just wash your hands before you start and avoid touching the battery surface directly. A plastic pry tool or wooden toothpick works better than your fingers for removing and inserting the battery anyway.