You can replace most watch batteries yourself in five minutes with tools under $10

A dead battery does not mean your watch is broken. Most watches with traditional quartz movements — the kind with a second hand that ticks — use a replaceable battery that costs $2 to $8. You can change it yourself with a case opener, a small screwdriver, and tweezers, all available at drugstores or online for under $10 total. The whole job takes about five minutes once you have the tools.

Some watches are sealed and require a jeweler or watch repair shop to open them safely. Smartwatches and fitness trackers almost always fall into this category — their batteries are glued in, not screwed, and opening them yourself will break the water resistance seal. But if you have a regular watch with a visible caseback (the metal or plastic cover on the back), you can almost certainly do this yourself.

Key Takeaways

  • Most traditional watches use a replaceable battery that you can change at home with a case opener, screwdriver, and tweezers.
  • Smartwatches and fitness trackers have glued batteries that require professional service to replace without breaking the water seal.
  • You need to know your watch's battery type before you buy a replacement — check the old battery itself or your watch manual.
  • The entire process takes about five minutes: open the case, remove the old battery, install the new one, and reseal the back.

What you need before you start

Gather four things: the correct replacement battery, a case opener tool, a small screwdriver (usually Phillips head), and tweezers. The case opener is the most important — it is a flat metal tool with a notch designed to pry open watch casings without scratching them. A regular flathead screwdriver will slip and damage the case.

To find the right battery, look at the old one. Open your watch case (see the next section), remove the battery, and read the code stamped on it. It will be something like SR626W, CR2032, or LR44. Write that number down and buy an exact replacement. If you cannot read the old battery or it is stuck, check your watch manual or search the watch brand and model online — most manufacturers list the battery type on their website.

Buy the battery from a drugstore, supermarket, or online. Do not assume all SR626W batteries are the same — they are, but some are better quality than others. Panasonic, Energizer, and Murata are reliable brands. Expect to pay $3 to $8 per battery.

How to open the caseback

Look at the back of your watch. If it is smooth metal or plastic with no seams, it is sealed and you should take it to a jeweler. If you see a thin line around the edge or small notches cut into the rim, that is a removable caseback.

Place the watch face-down on a soft cloth so the crystal (the glass or plastic face) does not scratch. Locate the notch or slot in the caseback rim — it is usually at the 6 o'clock position (the bottom). Insert the case opener tool into the notch and gently twist it counterclockwise, as if you were opening a jar. Do not force it. If it does not budge after light pressure, the case may be sealed. Stop and take it to a professional.

Once the caseback loosens, you can usually unscrew it the rest of the way by hand. Set it aside on the cloth. You will now see the watch movement — the gears and components inside — and the battery, which is usually a small silver disc held in place by a metal clip or spring.

Removing and replacing the battery

Use the tweezers to gently lift the battery out from under its clip or spring. Do not touch the battery's flat surfaces with your bare fingers — skin oils can reduce its lifespan. If the battery is stuck, a tiny dab of rubbing alcohol on the tweezers can help it slide out.

Before you install the new battery, check its orientation. The side marked with a + or the brand name should face up (toward you). Slide the new battery under the clip or spring in the same position the old one occupied. The clip should hold it snugly without you having to force it.

If your watch has a screw holding the battery clip in place, use your small screwdriver to remove it before taking out the battery, and replace it after the new battery is in. Tighten it gently — you only need enough pressure to hold the clip down, not enough to strip the screw.

Closing the caseback and testing

Align the caseback with the case body so the notch lines up with the slot. Press down gently and twist clockwise until you feel resistance. Do not over-tighten — the caseback should be snug but not require force to close. If it does not close smoothly, the battery may be positioned wrong or the gasket (the rubber seal) may be pinched. Open it again and check.

Once the caseback is closed, flip the watch over and check that the second hand is moving. If it is not, open the case again and make sure the battery is making contact with both the clip and the movement. A battery that is not seated fully will not work.

If the watch still does not run after you have checked the battery twice, the movement itself may be damaged or the battery you bought may be defective. Take it to a watch repair shop at that point.

When to take your watch to a professional

Do not attempt to open your watch if the caseback has no visible seams or notches, if it is held by screws you cannot access, or if it is a smartwatch or fitness tracker. These watches are sealed with adhesive and require special tools and a clean room to reopen without letting dust inside.

You should also take your watch to a professional if it has ever been water-resistant or if you plan to wear it in water. Opening the case breaks the seal, and a jeweler will need to replace the gasket and pressure-test the watch to restore water resistance. This costs $15 to $40 depending on the shop and watch, but it is worth it if you use your watch near water.

If your watch is valuable, vintage, or has sentimental meaning, a professional battery change is safer. A jeweler has insurance and experience with delicate movements. The cost is usually $10 to $25 for labor plus the battery.

Frequently Asked Questions

Can I change a smartwatch battery myself?

No. Smartwatch batteries are glued in, not screwed, and opening the case will break the water-resistant seal. Take it to the manufacturer's service center or an authorized repair shop. Battery replacement usually costs $40 to $80 and takes one to two weeks.

What if the caseback is stuck and will not open?

Stop trying. Forcing it will scratch the case or break the caseback. Soak the watch in warm water for a few minutes to soften any adhesive, then try again gently. If it still will not budge, take it to a jeweler — they have tools that explore even pressure without damaging the case.

How long does a new watch battery last?

Most quartz watch batteries last two to five years depending on the watch model and how often you wear it. Watches you wear daily drain batteries faster than ones you wear occasionally. Some watches with date windows or alarms drain batteries in one to two years.

Do I need to replace the gasket when I change the battery?

Only if your watch is water-resistant and you want to keep it that way. The gasket is the rubber seal that keeps water out. Opening the case can compress or damage it. If you do not plan to wear your watch in water, you do not need to replace it. If you do, a jeweler can do it for $10 to $20.

What should I do with the old battery?

Take it to a battery recycling program. Most drugstores and supermarkets have battery drop-off bins near the checkout. Do not throw it in the trash — watch batteries contain mercury or lithium and should be recycled.