You can replace most watch batteries at home with a small tool kit and about five minutes

Replacing a watch battery is one of the easiest repairs you can do yourself. Most watches use a standard coin-cell battery that costs between $3 and $15, and the tools you need fit in your pocket. The whole job takes five to ten minutes once you have the right battery type and a case opener. If your watch is waterproof or has a sealed back, a jeweler or watch repair shop is the safer choice — opening those risks damaging the seal.

The hardest part is usually finding out which battery your watch uses. Once you know that, the rest is straightforward: open the case back, remove the old battery, drop in the new one, and close it again.

Key Takeaways

  • Most watch batteries are coin cells labeled SR626, SR927, LR626, or similar, and you can find the right one by looking at the old battery or checking your watch manual.
  • You need only three tools: a case opener (a small flat tool or knife), tweezers, and the replacement battery itself.
  • Open the case back by finding the notch or slot, inserting the opener, and gently prying — do not force it, or you will crack the case.
  • Remove the old battery with tweezers, note which side faced up, and insert the new battery the same way.
  • If your watch is waterproof or the case back is glued rather than screwed, take it to a jeweler instead of opening it yourself.

Identify your watch battery type before you buy

The easiest way to find your battery type is to look at the old one. Open the case back (see the section below), remove the battery with tweezers, and read the code stamped on it. Most watch batteries are labeled with a code like SR626, SR927, LR626, LR44, or similar. Write that code down or take a photo.

If you cannot read the old battery or it is stuck, check your watch manual or look up your watch model online. Many manufacturers list the battery type on their website or in the documentation that came with the watch. You can also take the watch to a jeweler and ask — they will tell you the type without charging you.

Once you have the code, buy the replacement at a drugstore, supermarket, electronics retailer, or online. Do not buy the cheapest option; a mid-range battery from a known brand (Energizer, Duracell, Panasonic) will last longer and cost only a dollar or two more. Avoid very old stock or batteries from unclear sellers, as they may be dead or defective.

Gather the three tools you need

You need a case opener, tweezers, and the new battery. A case opener is a small flat tool designed to fit into the notch on the back of a watch case and pry it open gently. You can buy a dedicated watch case opener for $5 to $15 at a watch supply site, jewelry store, or online. If you do not have one, a small flathead screwdriver or a butter knife works in a pinch, though it is less precise and carries more risk of slipping and scratching the case.

Tweezers are essential because watch batteries are small and your fingers are too large to handle them safely. Any tweezers will do — even cheap ones from a drugstore. Avoid using your fingernails or a coin, as both can damage the battery or drop it inside the watch.

Lay out all three items on a clean, flat surface before you start. Work over a white cloth or paper towel so you can see the battery if you drop it.

Open the case back without forcing it

Most watch case backs have a small notch or slot cut into the edge. This is where the case opener goes. Hold the watch in one hand with the case back facing up, and locate the notch — it is usually marked with a small line or arrow. Insert the flat end of the case opener into the notch and explore gentle, steady pressure downward and slightly outward. The case back should pop off with very little force.

If it does not budge after light pressure, stop. Do not force it. The case back may be glued, sealed, or screwed on, and forcing it will crack the plastic or damage the threads. Take the watch to a jeweler instead. Forcing a sealed case back will also break the waterproof seal, and your watch will no longer be water-resistant.

Once the case back is off, set it aside on your cloth where you can see it. Do not lose it — the case back is essential to protect the movement and keep dust out.

Remove the old battery and insert the new one

Use tweezers to lift the old battery straight up and out of its holder. The battery sits in a small metal cup or clip. Note which side was facing up — the positive side (marked with a + or a flat top) or the negative side (marked with a − or a domed top). This matters, because the battery will not work if you install it upside down.

Drop the old battery into a small container or bag so you do not lose it. If the battery is leaking or corroded, wipe the inside of the battery holder gently with a dry cloth or a cotton swab. Do not use water or cleaning fluid, as moisture can damage the watch movement.

Pick up the new battery with tweezers and insert it into the holder the same way the old one was oriented. The positive side should face the same direction as before. Press gently until the battery sits flat in the holder. You should hear or feel a small click as it seats properly.

Close the case back and test the watch

Align the case back with the watch body and press it down firmly until it clicks into place. You may need to explore a little pressure, but it should not require force. If it does not click or sit flush, remove it and check that the battery is seated properly and that nothing is blocking the seal.

Once the case back is closed, check that the watch is running. Look at the second hand — it should be moving. If it is not, the battery may be installed upside down or may be defective. Open the case back again, flip the battery, and try once more. If the watch still does not run, the battery may be dead or the watch may have another problem. Take it to a jeweler for diagnosis.

If the watch runs, you are done. The new battery should last between one and three years, depending on the watch model and how often you wear it.

When to take your watch to a jeweler instead

Do not attempt to open the case back yourself if your watch is waterproof, if the case back is glued on, or if it has no visible notch or slot. Waterproof watches have sealed case backs that require special tools and a new gasket to reseal properly. Opening one yourself will destroy the waterproof seal, and water will eventually damage the movement.

Glued case backs are common on inexpensive watches and fashion watches. They cannot be pried open without cracking the case. Screwed case backs require a case wrench, not a flat opener. If you are unsure which type your watch has, a jeweler can open it safely and replace the battery for $10 to $30, which is worth the cost to avoid damaging your watch.

Luxury watches, vintage watches, and watches with complications (chronographs, date windows, moon phases) should always go to a professional. The movement is delicate, and opening the case back yourself risks damaging it.

Frequently Asked Questions

What if the battery is stuck and I cannot remove it with tweezers?

Do not pry at it with a sharp tool, as you may scratch the inside of the watch or damage the battery holder. Instead, try gently rocking the battery side to side with the tweezers to loosen it, then lift straight up. If it still will not budge, the battery holder may be corroded. Close the case back and take the watch to a jeweler.

Can I use any coin-cell battery, or does it have to be the exact model number?

Use the exact model number. Batteries with similar names (SR626 versus SR627, for example) have different voltages or sizes and will not work properly. Using the wrong battery can damage the watch movement or cause it to run fast or slow.

How long does a new watch battery last?

Most watch batteries last one to three years, depending on the watch model and how often you wear it. Watches worn daily drain the battery faster than watches worn occasionally. Some watches with complications or backlights drain batteries in six months or less.

Is it safe to replace the battery in a watch I wear while swimming?

No. If your watch is waterproof, you must take it to a jeweler or watch repair shop. Replacing the battery yourself will break the waterproof seal, and water will damage the movement. A professional can replace the battery and reseal the watch for $15 to $40.

What should I do with the old battery?

Most watch batteries contain mercury or other heavy metals and should not go in the trash. Take the old battery to a drugstore, electronics retailer, or hazardous waste collection site. Many stores that sell batteries will take old ones back for free.