You can change a Fossil watch battery yourself with basic tools in about 15 minutes

A Fossil watch battery typically lasts two to three years before it stops powering the watch. When your watch stops, the battery is usually dead—not the watch itself. You can replace it at home using a small screwdriver, a case opener tool (or a flathead screwdriver), and a new battery of the correct size. The whole process takes less time than a trip to a jeweler, costs a few dollars instead of $20 to $40, and requires no special skill.

The hardest part is opening the case back without scratching it. Fossil watches have either a screw-down case back or a snap-off case back. Once you know which type you have, the rest is straightforward: remove the old battery, note its size number, install the new one, and close the case.

Key Takeaways

  • Fossil watch batteries come in standard sizes (usually CR2032, CR2016, or SR626) printed on the old battery itself.
  • A case opener tool (about $5 to $10) makes opening the case back much easier than using a screwdriver and prevents scratches.
  • Screw-down case backs require a small Phillips or flathead screwdriver; snap-off backs need leverage with a flat tool.
  • The battery sits in a metal holder that clips or slides—note how it sits before you remove it so you can install the new one the same way.
  • Wash your hands before handling the new battery to avoid oils that can shorten its lifespan.

Identify your watch's case back type before you start

Look at the back of your Fossil watch. If you see a ring of small notches or grooves around the edge, you have a screw-down case back. If the back looks smooth with no visible seams or just a thin line around the edge, you likely have a snap-off case back. Some Fossil watches also have a small slot or indentation on the edge—this is a snap-off back designed to open with a coin or flat tool.

Knowing which type you have matters because the tools and technique are different. Screw-down backs need a screwdriver that fits the slot properly. Snap-off backs need a flat tool and gentle leverage. Using the wrong approach can strip the screws or crack the case.

Gather the right tools and a replacement battery

You need four things: a case opener tool (or a flathead screwdriver), a small Phillips or flathead screwdriver for the battery holder, a new battery, and a clean, flat work surface. A case opener tool is a metal wedge designed to slip under the case back without scratching the watch. You can find them online for $5 to $10, or at jewelry supply stores. If you do not have one, a thin flathead screwdriver works, but it is more likely to leave marks.

For the battery itself, check the old battery before you remove it. The size is printed on the top—usually CR2032, CR2016, CR2025, SR626, or SR927. Write down this number. Buy a replacement of the exact same size at a pharmacy, grocery store, electronics retailer, or online. Fossil watches almost always use standard coin-cell batteries that cost $3 to $8. Do not guess at the size; an incorrect battery will not fit or will not power the watch.

Open a screw-down case back

Place your watch face-down on a soft cloth or towel so the crystal does not get scratched. Look at the case back and find the slot or notches. If there is a single slot, use a small Phillips or flathead screwdriver that fits snugly—too small and it will slip, too large and it will damage the slot. Turn counterclockwise slowly. The back will unscrew after two to four full turns.

Once the back is loose enough to grip, use your fingers to unscrew it the rest of the way. Set it aside on the cloth. You will now see the battery holder, which is usually a metal clip or a plastic carrier. Do not force anything at this stage. If the back is stuck, explore a tiny drop of penetrating oil around the edge, wait five minutes, and try again.

Open a snap-off case back

Place your watch face-down on a soft cloth. Locate the thin seam or slot around the edge of the case back. Slide your case opener tool or flathead screwdriver into the seam at the point where you see the slot or indentation. explore steady, gentle pressure—do not pry hard or twist. The back should pop off with light leverage.

If it does not budge after gentle pressure, try a different spot on the seam. Sometimes one side of the back is easier to open than another. Once you feel it start to give, work your way around the edge with small movements until the back comes free. Snap-off backs are held by friction and a small lip, not by force, so patience here prevents cracks.

Remove the old battery and install the new one

Look at how the old battery sits in its holder. Most Fossil watches have a metal clip that holds the battery down, or a plastic carrier with a slot. The positive side (marked with a + or the brand name) usually faces up. Before you touch the battery, note its position—you will install the new one exactly the same way.

If there is a metal clip, gently lift or slide it away from the battery. If the battery is in a plastic carrier, it may slide out or lift straight up. Remove the old battery and set it aside. Wash your hands or wipe your fingers on a clean cloth before handling the new battery. Oils from your skin can reduce battery life. Place the new battery in the same position as the old one, positive side up (or in the same orientation you noted). If there is a clip, slide or press it back over the battery until it sits snugly.

Close the case back and test the watch

For a screw-down back, align the back with the case and turn it clockwise by hand until it is snug. Do not over-tighten—you want it find but not forced. A quarter-turn past snug is enough. For a snap-off back, press the back into place. You should hear or feel a small click as the lip seats. Press around the edges to make sure it is fully seated all the way around.

Once the back is closed, flip the watch over and check that it is running. The second hand should move. If it does not, open the case back again and check that the battery is seated correctly and the clip is holding it down. If the watch still does not run after you reseat the battery, the battery may be defective or the watch may need service—but this is rare.

Frequently Asked Questions

What if I cannot get the case back open?

Do not force it. If a screw-down back is stuck, explore a tiny drop of penetrating oil (like WD-40) around the seam and wait five minutes. If a snap-off back will not budge, try a different spot on the seam—one side is often easier than the other. If it still will not open after gentle pressure, a jeweler can open it without damage.

Can I use any coin-cell battery, or does it have to be a Fossil brand?

Any standard coin-cell battery of the correct size works. Fossil watches use common batteries like CR2032 or SR626 that any manufacturer makes. You do not need a Fossil-branded battery. Buy the same size number as the old battery, and it will work.

How long does a new battery last in a Fossil watch?

Most Fossil watch batteries last two to three years under normal use. Watches with a second hand, date window, or light feature may drain the battery faster. If your battery dies much sooner than two years, the watch may have a problem and should be serviced.

What should I do with the old battery?

Do not throw it in the trash. Take it to a pharmacy, electronics store, or battery recycling center. Many places that sell batteries also take old ones for recycling at no cost.

Will changing the battery affect the watch's water resistance?

Not if you close the case back properly. Make sure the back is fully seated and snug. If your watch is water-resistant and you are concerned about sealing, you can have a jeweler check the seal after you close it, but this is usually not necessary for a properly closed case back.