You can change most watch batteries yourself with a small tool and five minutes of time
Replacing a watch battery is a straightforward task that does not require a jeweler or special training. You need a case opener (a flat tool that costs $3 to $8), a small flathead screwdriver, and the correct replacement battery for your watch model. The whole process takes about five minutes once you have the right parts in front of you.
The hardest part is usually finding out which battery your watch uses. Check the back of your watch case — it often lists the battery type as a code like SR626W or LR44. If you cannot read it, take a photo of the back and search that code online, or bring the watch to a pharmacy or hardware store where staff can identify it for you.
Key Takeaways
- Most watch batteries cost $2 to $5 and are sold at pharmacies, hardware stores, and online retailers.
- You need a case opener tool and a small flathead screwdriver — both are inexpensive and reusable.
- The battery code is usually printed on the back of the watch case, and you should write it down before you shop.
- The entire battery swap takes about five minutes, and the hardest step is opening the case without scratching it.
- If your watch is waterproof, you may need to have the case resealed after the battery change, which a jeweler can do for $10 to $20.
Gather the right tools before you start
A case opener is a flat metal tool with a notch or slot designed to fit into the groove on the back of a watch case. You can buy one at any hardware store, pharmacy, or online for under $10. Some come as part of a watch repair kit that includes a small screwdriver and tweezers — that kit is worth buying if you plan to change batteries more than once.
You will also need a small flathead screwdriver, usually size 000 or 00. This opens the tiny screws that hold the battery compartment closed. A regular household screwdriver is too large and will strip the screws. If you do not have a small one, buy a jeweler's screwdriver set for $5 to $8.
Lay out a clean, flat surface — a kitchen table or desk works well. Use a white or light-colored cloth or paper towel underneath so you can see small parts if they drop. Have your replacement battery within arm's reach before you open the watch.
Open the watch case without damaging it
The back of your watch case has a thin groove that runs around the edge. This is where the case opener fits. Hold the watch firmly in one hand with the back facing up. Insert the flat end of the case opener into the groove at the 6 o'clock position (the bottom of the watch).
Gently twist the case opener counterclockwise, as if you were opening a jar. Do not force it — if it does not move after light pressure, try a different spot along the groove. The case will pop off suddenly once the seal breaks, so keep your hand steady so it does not fall. Set the case back down on your cloth when ready.
If the case has screws instead of a groove, use your small flathead screwdriver to remove them. There are usually two or three screws around the edge. Turn them counterclockwise and place them in a small cup or on a piece of tape so you do not lose them.
Remove the old battery and install the new one
Once the case is open, you will see the battery sitting in a small metal holder or clip. The battery is usually round and silver-colored. Use a small plastic tool or the edge of your screwdriver to gently pry it out of the holder — do not use your fingernail, as the battery can slip and fall.
Before you touch the new battery, wash your hands or wipe them on a clean cloth. Oils from your skin can damage some battery types and shorten their life. Pick up the new battery by its edges only, never the flat top or bottom surface.
Place the new battery into the holder with the positive side (marked with a + or the flat side) facing up. Press down gently until you hear or feel a small click — the battery should sit flush in the holder and not wobble. If it does not fit, double-check that you have the correct battery type.
Close the case and test the watch
Before you seal the case, check that the battery is sitting correctly and that no other parts have shifted inside. If everything looks right, align the case back with the body of the watch. The groove or screw holes should line up exactly.
If your case has a groove, insert the case opener into the groove at the 6 o'clock position and twist clockwise (like closing a jar) until you feel resistance. Do not over-tighten — you should feel a firm click or snap, not a grinding sensation. If your case has screws, replace them one at a time and tighten them snugly but not hard enough to strip them.
Once the case is closed, press the watch to your ear and listen for a ticking sound. If you hear it, the battery is working. Check that the watch hands move when you tap the face gently. If the watch does not work, open the case again and make sure the battery is seated correctly in the holder.
What to do if your watch is waterproof
If your watch is waterproof or water-resistant, opening the case breaks the seal. After you install the new battery and close the case, the watch may no longer be waterproof until the seal is replaced. Check the back of your watch for a waterproof rating — it usually says "water resistant" or "waterproof" followed by a depth in meters or feet.
If your watch has a waterproof rating and you want to restore that protection, take it to a jeweler after the battery change. They will install a new gasket (a rubber ring that creates the seal) and test the watch to confirm it is waterproof again. This usually costs $10 to $20 and takes a few days.
If your watch is not waterproof or you do not plan to wear it near water, you do not need to do anything else — the battery change is complete.
Common mistakes to avoid
The most common mistake is forcing the case opener too hard and scratching the back of the watch. Use gentle, steady pressure instead of sudden force. If the case does not open after light twisting, try a different spot along the groove — sometimes one spot opens more easily than others.
Another mistake is touching the battery with bare fingers, which can leave oils that shorten battery life. Wash your hands before handling the new battery, or use a small plastic tool to place it in the holder.
Do not over-tighten the case when you close it. You should feel a firm click or snap, not a grinding sound. Over-tightening can crack the case or strip the threads on screw-type cases.
Finally, do not assume you have the correct battery just because it looks similar to the old one. Battery codes that look alike (like SR626W and SR626SW) are not interchangeable. Always check the code on the back of your watch or the packaging of the old battery before you buy a replacement.
Frequently Asked Questions
Where do I buy a watch battery?
Watch batteries are sold at pharmacies (CVS, Walgreens), hardware stores (Home Depot, Lowe's), grocery stores, and online retailers like Amazon. Pharmacies often have a small selection and can identify your battery type if you bring the watch in. Online retailers usually have more options and lower prices, but you have to wait for shipping.
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 you wear every day drain batteries faster than watches you wear occasionally. Some battery types last longer than others — check the packaging or ask the store staff which type lasts longest for your watch model.
What if I drop the battery inside the watch?
If the battery falls into the case, do not shake the watch or turn it upside down. Tilt it gently so the battery rolls toward the opening, then use a small plastic tool or tweezers to retrieve it. If you cannot reach it, take the watch to a jeweler — they have tools designed for this and can remove it without damaging the watch.
Can I change the battery on a digital watch the same way?
Yes, digital watches use the same process. The case opener and screwdriver work the same way, and the battery sits in the same type of holder. The main difference is that digital watches often have more internal parts, so be extra careful not to disturb anything when the case is open.
Do I need to reset the watch after changing the battery?
Most analog watches (with hands) do not need to be reset — they will start working as soon as the new battery is installed. Digital watches may lose the time and date if the battery was completely dead before you replaced it. Check your watch manual for reset instructions, or search online for your watch model and "reset after battery change."