Most watch batteries take 5 to 15 minutes to replace at home with basic tools
You can change a watch battery yourself if the case back is not sealed and you have a small screwdriver, a plastic pry tool, and tweezers. The process is straightforward: open the case, note the battery type, remove the old battery, insert the new one the same way, and close the case. If your watch is waterproof, sealed, or has a screw-down case back, a jeweler or watch repair shop is safer — opening it yourself can break the seal and let water in.
The entire job costs $3 to $8 in parts if you do it yourself, or $15 to $40 if you take it to a shop. Doing it at home saves money and time, but you need steady hands and the right tools. If you drop a small part or strip a screw, the repair becomes more expensive.
Key Takeaways
- Watch batteries are identified by a code like SR626, CR2032, or LR44 — you must buy the exact same type to avoid damaging the watch.
- You need a case opener (or small flathead screwdriver), tweezers, and a plastic pry tool; metal tools can scratch the watch or cause electrical shorts.
- The battery sits in a metal holder with a small clip or spring — you must remove and reinsert it in the same direction, usually with the positive side facing up.
- If your watch is waterproof or has a screw-down case back, take it to a jeweler instead of opening it yourself.
- Most watch batteries last 2 to 5 years depending on the watch model and how often you wear it.
Identify your watch battery type before you buy a replacement
The battery code is printed on the old battery itself. You must remove the case back first to see it, but do not throw the old battery away until you have written down the number. Common codes are SR626, SR927, CR2032, LR44, and LR626 — each one is a different size and voltage, and using the wrong one can stop the watch or damage the movement.
If you cannot read the old battery or do not want to open the watch yet, search online for your watch brand and model number plus "battery type." Most manufacturers list it in the manual or on their website. You can also take a photo of the watch and show it to a jeweler, who can tell you the battery code in seconds.
Buy the replacement at a pharmacy, supermarket, electronics store, or online. A single battery costs $2 to $5. Buy two if you can — having a spare saves a trip if you make a mistake or the first one is defective.
Gather the right tools and set up a clean workspace
You need three things: a case opener (a small flat tool made for watches), tweezers, and a plastic pry tool or old credit card. A case opener looks like a tiny flathead screwdriver with a notch at the end. You can buy one for $3 to $8 at a pharmacy, watch repair shop, or online. Do not use a regular screwdriver — it is too thick and will slip and scratch the watch.
Work on a clean, flat surface with good light. Lay down a white cloth or paper towel so you can see small parts if they fall. Wear glasses if you need them. Turn off your phone and clear the table of clutter — a single distraction can send a tiny screw rolling across the floor.
Wash your hands before you start. Oil and dirt on your fingers can get inside the watch and cause the movement to stick or corrode.
Open the case back without damaging the watch
Most watch case backs are held on by a single screw or are friction-fit (they snap on and off). Look at the back of your watch. If you see a screw, use the case opener to unscrew it slowly — turn it counterclockwise and stop as soon as it is loose enough to lift out by hand. Do not force it.
If there is no screw, the case back is friction-fit. Locate the small notch or groove on the edge of the case back. Insert the plastic pry tool or credit card edge into the notch and gently twist or pry upward. The back should pop off. If it does not move after gentle pressure, try a different notch — some watches have two or three.
Once the case back is off, set it down in a safe place where it will not roll away. Look inside. You will see the watch movement (the gears and springs) and the battery, which looks like a small silver coin. The battery sits in a metal holder with a small metal clip or spring on top.
Remove the old battery and insert the new one
Use the tweezers to lift the metal clip or spring that holds the battery in place. Lift it gently — these clips are fragile and can break if you bend them too far. Once the clip is raised, slide the old battery out from underneath it. Do not touch the battery with your bare fingers; the oils on your skin can corrode the contacts.
Take the new battery and hold it with the tweezers. Look at the old battery to see which side was facing up — usually the positive side (marked with a + sign) faces up. Insert the new battery the same way, sliding it under the metal clip. Then lower the clip back down over the battery. It should sit flat and snug.
Before you close the case, press the crown (the button on the side of the watch) to see if the watch starts ticking. If it does, the battery is in correctly. If it does not tick, lift the clip again and flip the battery over — you may have inserted it upside down.
Close the case back and test the watch
If the watch is ticking, close the case back. If it has a screw, align the screw hole and turn the screw clockwise by hand first, then tighten it with the case opener. Turn slowly and stop as soon as you feel resistance — do not over-tighten or you will strip the screw hole.
If the case back is friction-fit, align it with the watch body and press down firmly until you hear or feel a click. The back should sit flush with the case. If there is a gap, it is not seated correctly — remove it and try again.
Once the case is closed, press the crown again and listen for ticking. Set the watch on a table and leave it for a few minutes to make sure it keeps running. If it stops, open the case again and check that the battery is seated under the clip and facing the right direction.
When to take your watch to a jeweler instead
Do not open the watch yourself if it is waterproof, has a screw-down case back (a back that screws on like a lid), or is a luxury or vintage watch. Waterproof watches have a rubber gasket or seal around the case back that keeps water out. Opening the watch breaks this seal, and even if you close it again, it may no longer be waterproof. A jeweler has the right tools to open and reseal it without damage.
Screw-down case backs require a special wrench to open and close without damaging the threads. If you use the wrong tool, you can strip the back and make it impossible to seal again. Luxury and vintage watches often have delicate movements that can be damaged by vibration or dust during the battery change.
A jeweler or watch repair shop will change the battery for $15 to $40 and can reseal the watch if needed. This is worth the cost if your watch is expensive or has sentimental value.
Frequently Asked Questions
How long does a watch battery last?
Most watch batteries last 2 to 5 years depending on the watch model and how often you wear it. Watches you wear every day drain the battery faster than watches you wear occasionally. Some high-end watches have batteries that last 10 years or more.
What happens if I put the battery in upside down?
The watch will not work. The battery will not make contact with the movement if it is facing the wrong way. If your watch stops ticking after you close the case, open it again and flip the battery over. It should start working when ready.
Can I use a different battery type if I cannot find the exact one?
No. Using the wrong battery type can stop the watch, damage the movement, or cause the battery to leak and corrode the inside of the watch. Always buy the exact code printed on the old battery. If you cannot find it, take the watch to a jeweler.
Do I need to reset the watch after changing the battery?
No. The watch will start running again as soon as the new battery makes contact with the movement. You do not need to wind it or set the time — it will pick up where it left off.
What should I do with the old battery?
Take it to a pharmacy, supermarket, or electronics store that has a battery recycling bin. Do not throw it in the trash — batteries contain chemicals that can leak into soil and water. Most stores that sell batteries also recycle them for free.