Open the case back without damaging your watch

Most Timex watches have a case back that unscrews or pops off. The method depends on your model. Look at the back of your watch — if you see a groove or notch running around the edge, it unscrews. If the back appears smooth with no seam, it likely pops off with a tool.

For a screw-off back, use a coin or a case opener tool. Place the coin or tool into the groove and turn counterclockwise slowly. Do not force it — if it does not budge after gentle pressure, try a different angle or a coin with a thinner edge. Once loose, unscrew by hand the rest of the way.

For a pop-off back, you need a case opener tool (a flat, thin metal tool with a notch). Slide the notch under the edge of the case back and gently pry upward. Work your way around the edge, lifting a little at a time, rather than prying hard in one spot. This prevents bending the case back.

Key Takeaways

  • Timex watches use either a screw-off or pop-off case back — check for a groove around the edge to tell which type yours is.
  • A coin works for screw-off backs; a case opener tool (under $10) is needed for pop-off backs and prevents damage.
  • The battery type and orientation matter — write down what you see before removing the old battery so you install the new one correctly.
  • Most Timex batteries cost $3 to $8 and last two to five years depending on the model and how often you use the watch.
  • If the watch still does not work after a new battery, the movement may need professional service rather than a straightforward battery swap.

Identify your battery type and note its position

Once the case back is open, look at the battery inside. Timex watches most commonly use coin-cell batteries — small, flat, round batteries that look like a tiny metal coin. The most frequent sizes are CR2032, CR2025, and SR626W. The battery type is usually printed on the battery itself.

Before you remove the old battery, note which side faces up. The positive side (marked with a + or a flat top) should face up in most Timex watches, but some models reverse this. Take a photo with your phone or write down the orientation. This takes 10 seconds and prevents installing the battery backward, which is the most common reason a watch does not work after a battery change.

If the battery is held in by a metal clip or retainer, note how it sits. Some clips hold the battery loosely; others grip it firmly. You will need to replace the clip in the same position when you install the new battery.

Remove the old battery and clean the contacts

Gently lift the old battery out of its slot. If a metal clip holds it, lift the clip first, then slide the battery out. Do not pry hard — if the battery does not lift easily, make sure the clip is fully released.

Once the battery is out, look at the metal contacts inside the watch case. These are the small metal pieces that touch the battery and complete the electrical circuit. If they look dirty, corroded, or dull, wipe them lightly with a dry cotton swab or a soft, lint-free cloth. Do not use water or cleaning solution — moisture can damage the watch movement. A light wipe is enough; you are just removing dust or oxidation.

If the contacts are heavily corroded (green or white buildup), the watch may need professional cleaning. Proceed with the battery change anyway — sometimes a fresh battery and clean contacts restore function.

Install the new battery in the correct orientation

Before you open the new battery package, wash your hands or wear cotton gloves. Oils from your skin can leave residue on the battery and reduce its lifespan. Remove the new battery from its package and hold it by the edges, not the flat surfaces.

Place the new battery into the slot with the positive side facing up (or in the orientation you noted from the old battery). If a metal clip holds the battery, position the battery first, then gently lower the clip over it. The clip should hold the battery snugly but not so tight that you have to force it. If the clip is too loose, the battery may shift and lose contact.

Close the case back by reversing the method you used to open it. For screw-off backs, screw clockwise by hand until snug, then use a coin to tighten gently — do not over-tighten, as this can strip the threads. For pop-off backs, press down evenly around the edge until you hear or feel a click.

Test the watch and troubleshoot if it does not work

Once the case back is closed, check whether the watch runs. Hold it to your ear and listen for a ticking sound, or look at the second hand to see if it moves. If the watch starts when ready, the battery change was successful. Most Timex watches begin running as soon as the battery makes contact.

If the watch does not run, open the case back again and check three things: the battery orientation (positive side should face up in most models), whether the battery is seated fully in its slot, and whether the metal contacts are touching the battery. Reposition the battery and try again.

If the watch still does not run after a second attempt, the problem is likely not the battery. The watch movement may need professional service, or the contacts may be too corroded to conduct electricity. At this point, contact a Timex service center or a local watch repair shop.

When to replace the battery versus seeking repair

A battery change is a straightforward task if the watch runs after you install the new battery. However, some situations call for professional service instead. If the watch has not run in months or years, the movement may have seized. If water has entered the case, corrosion inside may prevent the battery from working. If the watch ran intermittently before stopping, the movement may have a mechanical fault.

Timex watches are durable, but they are not sealed against moisture the way higher-end watches are. If your watch has been exposed to water or humidity, a battery change alone may not restore it. A professional can open the watch, clean the movement, and replace any damaged parts.

For most everyday Timex watches that straightforward stopped running, a battery change is the right first step. If that does not work, professional service is the next option.

Frequently Asked Questions

How long does a Timex battery last?

Most Timex batteries last two to five years depending on the model and how often you use the watch. Watches worn daily may drain batteries faster than those worn occasionally. If your battery dies much sooner than expected, the watch movement may be drawing excess power due to a mechanical issue.

Can I use any CR2032 battery, or does it have to be Timex brand?

Any quality CR2032 battery works in a Timex watch — the battery type, not the brand, is what matters. Buy from a pharmacy, electronics store, or online retailer. Avoid very cheap batteries from unknown sellers, as they may have lower capacity or poor contacts. A name-brand battery from Energizer, Duracell, or Panasonic costs a few dollars and lasts as long as a Timex-branded battery.

What if I lost the case opener tool and do not have a coin that fits?

A case opener tool costs $5 to $15 and is worth buying if you plan to change batteries regularly. If you need to open the watch now, try a flathead screwdriver (small size) or a butter knife edge in the groove. For pop-off backs, a flathead screwdriver can work in place of a case opener, though it is less precise and more likely to scratch the case back.

Is it normal for the watch to stop working right after I change the battery?

No — if the watch worked before and stops after a battery change, the battery is likely installed backward or not seated fully. Open the case back, check the orientation and position, and try again. If it still does not work, the old battery may have been the only problem and the watch movement may have other damage.

Do I need to set the time after changing the battery?

Yes. When the battery is removed, the watch stops and loses the time. Once you install the new battery and the watch starts, use the crown (the small knob on the side of the watch) to set the time. Pull the crown out one or two clicks and turn it to adjust the hour and minute hands, then push the crown back in.