You can change a Fossil watch battery yourself with basic tools, or take it to a jeweler or Fossil store

A Fossil watch battery typically lasts two to three years before it stops holding a charge. When your watch stops, the battery is usually the problem. You have two routes: open the case back yourself with a case opener tool and swap the battery, or pay a jeweler or Fossil retailer to do it. The DIY route costs $5 to $15 for the battery and tool. A jeweler or Fossil store charges $15 to $50 for the service, depending on your location and the watch model.

The process takes about five minutes if you have the right tools and know which battery your watch uses. If you choose the DIY path, you need the watch model number, a case opener (also called a case back remover), the correct replacement battery, and a small flathead screwdriver or tweezers. Fossil watches use common battery types like CR2032, SR626SW, or SR927W — the model number tells you which one.

Key Takeaways

  • Find your Fossil watch model number on the back of the case or in the original paperwork, then search that number plus "battery" to learn which battery type your watch needs.
  • A case opener tool costs $5 to $10 and is reusable; the battery itself costs $2 to $8 depending on the type.
  • Open the case back by inserting the case opener into the slot and turning counterclockwise, then lift out the old battery and drop in the new one with the positive side facing up.
  • If the watch still does not work after you change the battery, the problem may be corrosion inside the case or a faulty movement, not the battery itself.
  • A jeweler or Fossil store can change the battery in one day and will test the watch before you leave, which is useful if you are unsure whether the battery is the real problem.

Find your watch model number and the correct battery type

The model number is printed on the back of your Fossil watch case, usually near the bottom. It looks like "FS4735" or "ES3101" — a two-letter code followed by four numbers. Write this down or take a photo. You can also find the model number in your original purchase receipt or the box the watch came in.

Once you have the model number, search it on the Fossil website or on Google with the word "battery" after it. The search result will tell you the battery type — usually CR2032, SR626SW, SR927W, or SR920SW. Write down the exact battery type. Do not guess or buy a different type; the wrong battery may not fit or may damage the watch movement.

If you cannot find the model number, take a photo of the back of the watch and bring it to a Fossil store or jeweler. They can identify the battery type in seconds. This is also a good time to ask whether they will change it for you if the DIY route does not work.

Gather the tools and battery before you start

You need four things: a case opener tool, the correct replacement battery, a small flathead screwdriver or tweezers, and a clean, flat work surface. A case opener (also called a case back remover) is a small metal tool with a slot that fits into the groove on the back of your watch. You can buy one on Amazon or at a jewelry supply store for $5 to $10. It is reusable, so you only buy it once.

Buy the replacement battery from a pharmacy, electronics store, jewelry store, or online. Common types like CR2032 cost $2 to $5. Avoid very cheap batteries from unknown sellers; they may be old stock or counterfeit. A fresh battery from a known brand (Energizer, Duracell, Panasonic) is worth the extra dollar.

Set up your work area on a clean table or desk with good light. Lay down a small cloth or paper towel so you do not lose the tiny screws or battery. Wash your hands before you start; oils from your skin can corrode the battery contacts.

Open the case back and remove the old battery

Hold the watch face-down in your non-dominant hand. Locate the slot or groove on the back of the case — it is usually a small notch at the edge. Insert the case opener tool into the slot and turn it counterclockwise (to the left) about a quarter turn. You should feel slight resistance. Do not force it; if it does not turn, you may have the wrong angle or the wrong tool.

Once the case back loosens, lift it off with your fingers or tweezers. Set it aside on your cloth. You will now see the battery, usually held in a small metal clip or sitting loose in a shallow compartment. If the battery is held by a clip, gently pry one end of the clip up with a flathead screwdriver or tweezers and slide the battery out. If it is loose, straightforward lift it out with tweezers.

Look at the battery as you remove it. The side facing up is the positive side (marked with a + or a flat surface). The side facing down is the negative side. Remember this orientation — the new battery must go in the same way.

Install the new battery and close the case

Take the new battery out of its packaging and hold it with tweezers or your fingers. Insert it into the compartment with the positive side (the flat or + side) facing up, the same way the old battery was oriented. If the battery is held by a clip, slide it under the clip until it clicks or sits snugly. If there is no clip, the battery should sit flat in the compartment.

Close the case back by aligning it with the case and pressing down gently. Insert the case opener tool into the slot again and turn it clockwise (to the right) until you feel resistance. Do not over-tighten; you only need to turn it about a quarter turn. The case back should be snug but not so tight that you cannot open it again later.

Press the crown (the button on the side of the watch) or move the hands to see if the watch starts working. If it does, you are done. If it does not, wait a few seconds — sometimes the movement needs a moment to start. If the watch still does not work after 30 seconds, the problem may not be the battery.

What to do if the watch does not work after you change the battery

If the watch does not start after you install the new battery, first check that the battery is installed correctly. Open the case back again and confirm that the positive side is facing up and the battery is sitting flat in its compartment. Close the case and wait another 30 seconds.

If the watch still does not work, the problem is likely corrosion inside the case, a broken contact, or a faulty movement. Corrosion looks like white, green, or blue discoloration on the metal contacts or inside the case. If you see corrosion, a jeweler can clean it, but this is beyond a DIY fix. A faulty movement — the internal mechanism that makes the watch run — also requires professional repair.

At this point, take the watch to a Fossil store or jeweler. Bring the new battery with you and tell them you already changed it. They can test the watch, identify the real problem, and tell you whether repair is worth the cost. For older Fossil watches, repair may cost more than the watch is worth, and replacement may be the better choice.

When to take your watch to a professional instead

If you do not have a case opener tool and do not want to buy one, a jeweler or Fossil store will change the battery for $15 to $50 depending on your location and the watch model. This is the safest route if you are not comfortable opening the case yourself or if you are worried about damaging the watch.

A professional will also test the watch before you leave, so you will know right away whether the battery was the problem or whether something else is wrong. Many jewelers offer same-day service, so you can drop off your watch in the morning and pick it up by evening. Fossil stores may take longer if they are busy, so call ahead.

If your watch is under warranty or was recently purchased, check whether Fossil will change the battery for free. Some retailers offer free battery changes for a limited time after purchase. A quick call to the store where you bought it can save you money.

Frequently Asked Questions

How long does a Fossil watch battery last?

Most Fossil watch batteries last two to three years with normal use. If you wear the watch every day, the battery may last closer to two years. If you wear it occasionally, it may last three years or longer. The battery drains even when you are not wearing the watch, so it will eventually die even if the watch sits in a drawer.

Can I use any battery that fits in the case?

No. You must use the exact battery type specified for your watch model. Using the wrong battery can damage the movement or cause the watch to stop working. The model number on the back of your watch tells you which battery type is correct — do not guess.

What if I lose the tiny screws when I open the case?

If you lose a screw, a jeweler can replace it for a few dollars. To avoid losing screws, work on a clean cloth or paper towel and keep screws in a small cup or container as you remove them. If your Fossil watch does not have screws inside the case (many do not), this is not a concern.

Will changing the battery myself void the warranty?

Most Fossil watches are no longer under warranty by the time the battery dies, since batteries last two to three years and most warranties are one year. If your watch is still under warranty, check the warranty terms before opening the case. Some warranties do not cover battery changes, but opening the case yourself may void other coverage.

Can I change the battery if the watch is water-resistant?

Yes, but be careful. Water-resistant watches have a seal around the case back. When you open it, you break that seal. After you change the battery and close the case, the watch may no longer be water-resistant. If your watch is water-resistant and you want to keep it that way, take it to a jeweler or Fossil store — they can reseal it after changing the battery.