Open the watch case back without damaging the watch

Most Citizen watches have a screw-down case back or a snap-off back. The method depends on which type you have. Look at the back of your watch: if you see small notches or grooves around the edge, it is a screw-down back. If the edge looks smooth or has a thin seam, it is a snap-off back.

For a screw-down back, you will need a case-back opener tool — a small metal device with prongs or a slot that grips the notches. Place the watch face-down on a soft cloth to protect the crystal. Insert the opener into the notches and turn counterclockwise slowly. Do not force it; if it does not turn, the tool may not be seated correctly. Once loose, unscrew by hand the rest of the way.

For a snap-off back, slide a thin, flat tool (a case knife or old credit card works) into the seam between the case and the back. Gently pry upward around the edge, working your way around the watch. The back will pop off with a small click. Avoid using a sharp knife, which can slip and scratch the case.

Key Takeaways

  • Citizen watches use either a screw-down back (with notches) or a snap-off back (with a seam), and the removal method differs for each.
  • A case-back opener tool costs $5 to $15 and is reusable; attempting to open a screw-down back with household tools risks stripping the notches.
  • The battery sits under a metal clip or holder; note which direction it faces before removal so you can install the new one the same way.
  • Most Citizen watches use a CR2032, CR2025, or SR626SW battery, but check your old battery or the watch manual to confirm the exact model.
  • If the watch has a gasket or rubber seal inside the case back, do not lose it — it keeps water out and must sit flat when you close the back.

Locate and remove the battery

Once the case back is open, you will see the battery holder — usually a small metal clip or plastic tray in the center of the watch movement. The battery is round and flat, typically silver-colored. Before you touch it, take a photo or make a note of which side faces up (the positive or negative side). This matters when you install the new battery.

Use a plastic or wooden tool to gently lift the battery out of its holder. A plastic spoon handle, a wooden toothpick, or a plastic tweezers works well. Do not use a metal tool directly on the battery, as this can cause a short circuit. If the battery is stuck, do not pry hard — a small amount of gentle rocking usually frees it. Once it lifts, set it aside on a clean surface.

Check whether there is a gasket or rubber seal inside the case back. If you see a thin rubber ring, leave it in place. If it comes out with the back, set it aside carefully — you will need to reinstall it before closing the watch.

Identify the correct replacement battery

The old battery you just removed has a model number stamped on it — something like CR2032, CR2025, SR626SW, or SR920SW. This number tells you exactly which battery to buy. If the number is worn away, check your Citizen watch manual or look up your watch model online; Citizen publishes battery specifications for most models.

Do not assume all watch batteries are the same size. A CR2032 is thicker than a CR2025, and using the wrong one can prevent the case back from closing properly or cause the battery to rattle inside. Buy the exact model. You can find these batteries at drugstores, supermarkets, electronics retailers, and online for $3 to $8. Some watch repair shops will also install a battery for $10 to $20 if you prefer not to do it yourself.

Install the new battery

Before you place the new battery in the holder, check its orientation. The battery has a flat positive side (marked with a + or a flat surface) and a negative side (usually slightly recessed). Look at how the old battery was positioned and match that orientation exactly. Most Citizen watches have the positive side facing up, but some have it facing down — your photo from earlier will confirm which.

Slide the new battery into the metal clip or plastic tray, making sure it sits flat and level. The clip should hold it snugly without you having to force it. If the battery rocks or sits at an angle, remove it and reseat it. A battery that is not level can cause poor contact and the watch will not run.

Close the case back and test the watch

Before you seal the watch, check one more time that the gasket or seal is in place if your watch has one. It should sit flat in a groove around the inside edge of the case back. If it is wrinkled or twisted, straighten it now.

For a snap-off back, align the back with the case and press down firmly around the entire edge until you hear or feel a click all the way around. Press the center last — this ensures the seal sits evenly. For a screw-down back, thread the back by hand first to make sure it is aligned, then use the case-back opener to tighten it clockwise. Tighten firmly but do not over-tighten, which can strip the threads or crack the seal.

Once closed, hold the watch to your ear and listen for ticking. If you hear nothing, the battery may be installed backwards or not seated properly. Open the back again and check the orientation and seating. If the watch ticks, set it to the correct time and wear it normally. Most Citizen watch batteries last two to three years before needing replacement.

Common mistakes to avoid

The most frequent error is installing the battery backwards. If the watch does not tick after you close it, this is almost always the reason. Open the back and flip the battery 180 degrees. Another common mistake is forgetting the gasket or seal — if you lose it or leave it out, water can enter the case and damage the movement. If you removed a seal, keep it in a safe place until you are ready to close the watch.

Do not use a metal tool to pry the battery out or to handle it directly, as this can cause a short circuit and drain the battery when ready. Plastic or wood is safer. Also, do not touch the battery with bare fingers more than necessary — skin oils can interfere with electrical contact, though this is rare with modern batteries. If the case back will not close after you install the new battery, the battery may be the wrong size or thickness. Remove it, double-check the model number, and confirm you have the correct one.

When to take your watch to a professional

If the case back is stuck and will not open after gentle attempts, or if you hear a grinding sound when turning the opener, stop and take the watch to a jeweler or Citizen service center. Forcing a stuck back can strip the threads or crack the case. Similarly, if the watch still does not run after you install a new battery in the correct orientation, the movement may need servicing — a professional can diagnose whether it is a contact issue, a damaged circuit, or a mechanical problem.

If your watch is water-resistant and you are uncomfortable handling the gasket or seal, a professional replacement costs $15 to $40 and guarantees the water resistance remains intact. This is worth the cost if your watch is expensive or you use it in wet conditions.

Frequently Asked Questions

What if I cannot find the exact battery model number?

Search online for your Citizen watch model number (usually on the case back or in the manual) plus the word "battery." Citizen publishes specifications for most models. You can also bring the old battery to a drugstore or electronics retailer and ask them to match it by size and voltage. Do not guess — installing the wrong size can prevent the case from closing or cause the battery to move inside the watch.

Can I use a rechargeable battery in my Citizen watch?

No. Citizen watches are designed for single-use alkaline or silver-oxide batteries. Rechargeable batteries have different voltage and chemistry, and they will not power the watch correctly. If your Citizen is a solar model, it charges through the dial and does not use a replaceable battery at all.

How long does a Citizen watch battery usually last?

Most Citizen watch batteries last two to three years with normal daily wear. If you wear the watch constantly, the battery may last closer to two years. If you wear it occasionally, it may last three years or longer. Leaving the watch unworn does not extend battery life — the battery drains slowly even when the watch is not on your wrist.

Is it safe to open my Citizen watch myself if it is water-resistant?

Yes, as long as you handle the gasket or seal carefully and reinstall it correctly. The gasket is what keeps water out, not the case back itself. If you remove the back, take out the gasket, and then reinstall both properly, the water resistance remains intact. If you lose the gasket or install it crooked, water can enter. If you are unsure, a professional battery replacement preserves the water resistance may provide.

What should I do with the old battery?

Most watch batteries contain mercury or other materials and should not go in the trash. Take the old battery to a drugstore, electronics retailer, or hazardous waste collection site. Many places that sell batteries will also take old ones for recycling at no charge.