You can change most Timex watch batteries yourself with a coin and a flat surface

Most Timex watches use a snap-back case that opens from the rear, not the front. You do not need special tools — a coin (usually a quarter or dime) and a clean, flat work surface are enough. The whole job takes about five minutes, and you will save the $15 to $25 that a jeweler charges for the same work.

The battery itself costs $3 to $8 depending on the model. Timex watches typically use common battery types like SR626SW, SR927SW, or CR2032, which you can buy at drugstores, supermarkets, or online. Before you start, find out which battery your watch needs — the model number is usually printed on the back of the case or in your manual.

Key Takeaways

  • Most Timex watches have a snap-back case that you open by inserting a coin into the slot and twisting counterclockwise.
  • Write down the battery type printed on the old battery before you remove it, so you buy the correct replacement.
  • The battery sits in a metal holder that you lift out gently — do not force it or bend the contacts.
  • Wear a static-safe wrist strap or touch a metal part of the watch case before handling the new battery to avoid damaging the movement.

Locate the battery type on your watch

Open the back of your watch first. Look for a thin slot around the edge of the case back — this is where you insert the coin. The battery type is printed on the inside of the case back or on a sticker on the movement itself. Common Timex batteries are SR626SW (silver oxide, used in most dress and sport watches), SR927SW (slightly larger), and CR2032 (coin cell, used in some digital models).

If you cannot read the printing clearly, take a photo with your phone and zoom in, or look up your watch model number online. Buying the wrong battery means a wasted trip and a watch that will not work. If the case back has no printing, check your watch manual or search the model number on Timex's website.

Open the case back with a coin

Place your watch face-down on a clean, soft cloth or paper towel. This protects the crystal (front glass) from scratches. Find the slot in the case back — it is usually a small notch or groove around the edge.

Insert a coin (quarter or dime works best) into the slot so the edge of the coin sits firmly in the notch. Turn the coin counterclockwise — the direction is important. You should feel the case back loosen after a quarter turn or so. Once it is loose enough, remove the coin and unscrew the case back by hand. Set it aside on a clean surface where you will not lose it.

Remove the old battery and note its type

Inside the case, you will see the watch movement (the internal mechanism) and a metal battery holder. The battery sits in this holder, usually held in place by a small metal clip or spring. Before you touch anything, look at the old battery and write down the type number printed on it — this is your confirmation that you have the right replacement.

Gently lift the metal clip or spring that holds the battery in place. The battery should come out easily. If it does not, do not force it — wiggle it gently side to side while lifting. Once the old battery is out, set it aside. Do not touch the movement itself or the metal contacts inside the case.

Install the new battery and close the case

Before you handle the new battery, touch a metal part of the watch case with your bare hand. This removes static electricity that could damage the movement. Wear a static-safe wrist strap if you have one. Hold the new battery by its edges only — do not touch the flat surfaces.

Place the new battery into the holder with the positive side (marked with a + or the shiny side) facing up, unless the old battery was installed the opposite way. Lower the metal clip or spring back into place over the battery. The battery should sit flat and find. If it rocks or moves, remove it and check that it is seated correctly in the holder.

Seal the case back and test the watch

Pick up the case back and check that the rubber gasket (the thin ring around the edge) is clean and in place. If it is cracked or missing, the watch will not be water-resistant. Align the case back with the case and press it down gently while turning it clockwise with your coin until it is snug. Do not over-tighten — you should feel resistance, but you should not have to force it.

Flip the watch over and check that it is running. If it has a second hand, watch it tick for a few seconds. If the watch does not start, remove the case back and check that the battery is seated correctly and the clip is holding it down. If the watch still does not work after you reseat the battery, the movement may need service — take it to a jeweler or contact Timex.

Frequently Asked Questions

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

Do not force it. Try a different coin with a thicker edge, or wrap a rubber band around the coin to improve grip. If the case back is truly stuck, soak the watch in warm (not hot) water for a few minutes to loosen any corrosion, then dry it completely and try again. If it still will not budge, a jeweler has tools to open it without damaging the case.

Can I use any battery as long as it fits?

No. Using the wrong battery type can cause the watch to run fast or slow, or not run at all. Some battery types have different voltage or chemistry that the movement is not designed for. Always match the type number exactly — SR626SW is not the same as SR927SW, even though they look similar.

How long does a Timex watch battery last?

Most Timex batteries last two to three years with normal wear. Watches worn daily may drain the battery faster. Chronographs and watches with backlights drain batteries more quickly than straightforward three-hand models. If your battery dies much sooner than expected, the movement may have a short and should be checked by a jeweler.

Do I need to waterproof the watch after changing the battery?

If the rubber gasket is intact and you sealed the case back properly, the watch should maintain its original water resistance. However, if the gasket is cracked or missing, the watch is no longer water-resistant and should not be submerged. Replace the gasket if needed, or have a jeweler do it.

What should I do with the old battery?

Most watch batteries contain mercury or other materials that should not go in the trash. Take the old battery to a drugstore, supermarket, or electronics retailer that has a battery recycling bin. Many accept them for free. Some jewelers will also take old batteries when you buy a replacement.