You can change most watch batteries yourself with a small screwdriver and a few minutes

Changing a watch battery is a task you can do at home if the watch case opens from the back. You need a case opener (or a small flathead screwdriver), a fresh battery in the correct size, and tweezers or a plastic tool to avoid touching the battery with your fingers. The whole job takes about five minutes once you have the right tools. If your watch is sealed or has a screw-down case back, a jeweler or watch repair shop is the safer choice — forcing it open can damage the waterproofing.

The most common watch batteries are coin cells labeled CR2032, SR626, or LR626. You can find the correct size by looking at the old battery itself or checking your watch manual. Most drugstores, supermarkets, and online retailers stock these batteries for under $5.

Key Takeaways

  • Most watch batteries cost $2 to $8 and last two to five years depending on the watch model and how often you wear it.
  • You need a case opener tool (or small flathead screwdriver), the correct replacement battery size, and tweezers to avoid skin oils on the battery.
  • The battery size is printed on the old battery itself — common sizes are CR2032, SR626, and LR626.
  • If your watch has a screw-down case back or is marked waterproof, take it to a jeweler instead of opening it yourself.

Find the correct battery size before you start

The easiest way to know which battery your watch needs is to look at the old one. When you open the case back, the battery will have a code stamped on it — CR2032, SR626, LR626, and SR927 are the most common. Write down this code or take a photo before you remove the battery.

If you cannot read the old battery or it is already gone, check your watch manual or the manufacturer's website. You can also bring the watch to a drugstore or jeweler and ask them to identify the size without opening it. Once you know the code, buy a fresh battery of the same type. Avoid the cheapest options — a mid-range brand like Energizer or Panasonic will last longer than a no-name battery.

Gather your tools and prepare your workspace

You need three things: a case opener tool, tweezers or a plastic battery tool, and the replacement battery. A case opener is a small metal pry tool with a flat blade designed to fit the groove on the watch case back without slipping. You can buy one online for $3 to $10, or use a small flathead screwdriver if the groove is wide enough. Avoid using a knife or coin — they slip easily and can scratch the case.

Work on a clean, flat surface with good light. A desk lamp or phone flashlight pointed at the watch helps you see the small battery and the case back clearly. Lay out a small cloth or paper towel to catch the battery if you drop it — watch batteries roll easily and disappear under furniture. Wash your hands before you start so skin oils do not transfer to the battery, which can shorten its life.

Open the case back without damaging the watch

Look at the back of the watch for a groove or notch around the edge of the case back. This is where the case opener fits. The groove is usually on the side of the case back, not the center. Insert the blade of the case opener into the groove and gently twist or pry upward. Do not force it — if the tool does not fit smoothly, you may have the wrong tool or the wrong angle.

Once the case back starts to lift, you can usually pop it off by hand. Set it aside on your cloth so you do not lose it. If the case back has a rubber gasket (a thin ring of rubber around the edge), note which side faces outward — you will need to put it back the same way. Do not remove the gasket unless it is damaged.

Remove the old battery and insert the new one

The battery sits in a small metal holder or clip inside the case. Use your tweezers or plastic tool to gently lift one edge of the battery and slide it out. If the battery is stuck, a tiny dab of rubbing alcohol on the edge can help loosen it — let it sit for a few seconds before trying again. Do not use force, as you can damage the holder.

Before you insert the new battery, check that the positive side (marked with a + or the shiny side) faces up. Slide the new battery into the holder with the same orientation as the old one. Press gently until you hear or feel a small click — the battery should sit flat and not rock. If it does not fit snugly, you may have the wrong size battery.

Close the case back and test the watch

Align the case back with the case body so the groove lines up with the opener slot. Press down firmly and twist clockwise with the case opener until you feel resistance. Stop when the case back is snug — do not over-tighten, as this can crack the case or damage the gasket. The case back should sit flush with the case body with no gaps.

Check that the watch is running by holding it to your ear and listening for a ticking sound, or by looking at the second hand to see if it is moving. If the watch does not start, remove the case back and check that the battery is seated correctly and facing the right direction. Reinsert it and close the case again. If the watch still does not work after two attempts, the battery may be defective or the watch may have a deeper problem — take it to a jeweler at that point.

When to take your watch to a professional instead

Some watches are not meant to be opened at home. If your watch case back has screws, do not attempt to open it yourself — use a screwdriver on a sealed case can strip the screws or damage the case. If the case back is marked "water resistant" or "waterproof," opening it yourself will break the seal and let moisture inside, which can rust the movement and stop the watch. Luxury watches, vintage watches, and sports watches with high water resistance should always go to a jeweler.

A jeweler will change the battery for $15 to $50 depending on the watch and your location. They have the right tools to open sealed cases without damage and can check the gasket and movement while the case is open. If your watch is under warranty, opening it yourself may void the warranty — check your manual first.

Frequently Asked Questions

How long does a watch battery last?

Most watch batteries last two to five years. Quartz watches with straightforward movements use less power and get longer life. Watches with date windows, alarms, or backlights drain the battery faster. If your watch stops after a few months, the battery may be defective or the watch may have a short circuit — take it to a jeweler.

Can I use any battery that fits in the slot?

No. The voltage and chemistry matter. A CR2032 and a BR2032 look identical but have different voltages, and using the wrong one can damage the watch movement. Always match the code on the old battery exactly. If you cannot read it, ask a jeweler or the manufacturer.

What if the case back is stuck and will not open?

Do not force it. Try warming the case back with warm (not hot) water for a minute to expand the metal slightly, then try again. If it still will not budge, the case back may be corroded or glued shut — take it to a jeweler rather than risk cracking the case or stripping the groove.

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

Not usually. The gasket lasts many battery changes. Replace it only if it is cracked, dried out, or no longer seals properly. A jeweler can replace it for $5 to $15 if needed. If your watch is water resistant, ask the jeweler to check the gasket while they have the case open.

Why does my watch stop working right after I change the battery?

The battery is usually not seated correctly or is facing the wrong direction. Remove the case back, check that the positive side of the battery faces up, and press it firmly into the holder until it clicks. If it still does not work, the battery may be defective — try a fresh battery from a different package or brand.