You can replace most watch batteries without tools or a jeweler

A dead watch battery usually means a trip to a jeweler and a $15 to $40 charge for five minutes of work. You can do the same job at home for $3 to $8 if your watch has a removable back. The process takes ten minutes and requires only a coin, a small flathead screwdriver, and a replacement battery — all available at drugstores or online.

Not every watch works this way. Watches that are waterproof, sealed, or have a screw-down crown typically need professional service because opening them risks damaging the seal. Smartwatches and fitness trackers almost never have user-replaceable batteries. But if you have a standard analog watch with a snap-off or screw-off back, you can handle this yourself.

Key Takeaways

  • Most standard watches have a removable back that opens with a coin or small screwdriver, letting you access the battery without special tools.
  • You need to know your watch's battery type before you buy a replacement — the number is printed on the old battery itself.
  • Waterproof watches and smartwatches should not be opened at home because the seal is difficult to restore correctly.
  • The entire process takes about ten minutes and costs less than a jeweler visit, but only if your watch has a removable back.

Identify your watch's battery type before you start

The battery type is printed directly on the old battery, so you need to open the watch first to read it. Common types are SR626, SR927, LR626, and CR2032 — the letters tell you the chemistry (silver oxide, alkaline, or lithium) and the numbers tell you the size. You do not need to understand the chemistry; you only need to match the number exactly when you buy the replacement.

Write down the battery type before you close the watch again. If you forget it, you will have to open the watch a second time. Most drugstores and supermarkets stock the common types in their watch or jewelry section, and they cost between $3 and $8 per battery. Online retailers like Amazon usually have them cheaper if you are willing to wait for shipping.

Open the watch back without damaging the case

Look at the back of the watch. You will see either a smooth metal circle with a small notch or slot, or a circle with small notches around the edge like a jar lid. The smooth back opens with a coin; the notched back opens with a screwdriver.

For a smooth back, hold the watch face-down in your non-dominant hand. Find the small notch or slot on the edge of the back. Insert a coin — a dime or penny works — into the slot and turn it counterclockwise, the same direction you would unscrew a jar. Turn gently; the back should pop off after a quarter turn or less. If it does not move, you may have the wrong direction or the wrong notch. Stop and look for another slot.

For a notched back, use a small flathead screwdriver that fits snugly into one of the notches. Turn counterclockwise the same way. Again, turn gently — you are not forcing anything. Once the back is loose, you can usually unscrew it by hand.

Remove the old battery and note its position

Once the back is open, you will see the battery sitting in a small metal holder or clip. Before you touch anything, take a photo of the battery in place. The battery has a positive side (marked with a plus sign) and a negative side. The positive side almost always faces up toward you, but the photo ensures you put the new battery in the same way.

The battery may be held in place by a metal clip or spring. Gently lift the clip or spring away from the battery — it usually swings or slides to the side. Do not force it. Once the clip is clear, the battery should lift out easily. If it does not, stop and check whether you have lifted the clip far enough.

Insert the new battery and close the watch

Before you install the new battery, check that the positive side (the plus sign) is facing the same direction as it was in your photo. Slide the new battery into the holder, making sure it sits flat and level. Then swing or slide the metal clip back over the battery to hold it in place. The clip should sit snugly but not require force.

Close the watch back by reversing the opening process. For a coin-slot back, insert the coin and turn clockwise until the back is snug — do not over-tighten. For a notched back, align the notches and turn clockwise with the screwdriver until snug. The back should sit flush with the case with no gaps. If there is a gap, the back is not fully seated; open it and try again.

Test the watch and handle any problems

Once the back is closed, the watch should start ticking when ready if it has a second hand. If it does not, open the back and check that the battery is seated flat and the clip is holding it firmly. The most common problem is a battery installed upside down or not pushed all the way into the holder.

If the watch still does not work after you have checked the battery position, the problem may not be the battery. The watch may have a broken movement or a corroded contact inside. At that point, a jeweler is the right choice. But if the watch starts working, you are done — close the back, set the time if needed, and you have saved yourself a jeweler visit.

When to take the watch to a professional instead

Do not attempt to open a watch if the back is sealed with no visible notch or slot. Waterproof watches and dive watches are sealed with gaskets that are difficult to replace correctly, and opening one at home can ruin the waterproofing. The same applies to watches with a screw-down crown (the knob you use to set the time) — these are usually high-end watches where the seal matters.

Smartwatches and fitness trackers do not have user-replaceable batteries. If the battery is dead, the device needs to be replaced or sent to the manufacturer. Some brands offer battery replacement as a paid service, but it requires sending the watch to them. Check the manufacturer's website for your specific model.

Frequently Asked Questions

What if I cannot get the watch back open?

Stop and do not force it. The watch may have a sealed back, or you may be turning in the wrong direction. Try the other direction (clockwise instead of counterclockwise). If it still will not budge, the watch likely has a sealed back and needs professional service. Forcing it will damage the case.

Can I use any battery that is the same size?

No. The battery type number (like SR626) specifies both the size and the chemistry. Using the wrong chemistry can cause the watch to run fast or slow, or damage the movement. Always match the number exactly. If you cannot read the old battery, take it to a drugstore and ask them to identify it.

How long does a new battery last?

Most watch batteries last between one and three years, depending on the watch model and how often you wear it. Some last longer. When the battery dies, you straightforward repeat the process. There is no limit to how many times you can replace the battery yourself.

What should I do with the old battery?

Most watch batteries contain mercury or other materials that should not go in the trash. Take the old battery to a drugstore, jeweler, or electronics recycler that accepts batteries. Many drugstores have a battery recycling bin near the checkout.

Will opening the watch void the warranty?

If the watch is still under warranty, opening it yourself may void the warranty. Check the warranty paperwork or the manufacturer's website before you open the back. If the watch is out of warranty, opening it yourself carries no risk to your coverage.