You can replace a Fossil watch battery yourself with basic tools, or take it to a jeweler or Fossil retailer for about $10 to $25

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 culprit. You have two routes: open the case yourself using a case opener tool and a fresh battery, or hand it to a professional who has the right equipment and can may provide the seal stays waterproof.

The DIY route takes 10 to 15 minutes and costs $3 to $8 for the battery itself. The professional route costs more but removes the risk of damaging the case back or losing the waterproof seal. Either way, you need to know what battery your watch uses—that information is printed on the old battery once you open the case, or you can find it in your watch's documentation.

Key Takeaways

  • Fossil watch batteries are standard coin-cell types (usually CR2032, CR2025, or SR626SW) that you can buy at drugstores, electronics retailers, or online for a few dollars.
  • Opening the case yourself requires a case opener tool (a flat metal pry tool, about $5 to $10), a small screwdriver if your model has screws, and steady hands to avoid scratching the case.
  • If your watch is water-resistant, opening it yourself may break the seal; a jeweler or Fossil store can replace the battery and re-seal it properly.
  • The battery sits in a small metal holder inside the case; you lift the old one out, drop the new one in with the positive side facing up, and close the case back.
  • If you are unsure about the battery type or uncomfortable prying open your watch, a jeweler or Fossil retailer will do it for $10 to $25 and warranty the work.

Identify your watch battery type before you start

The battery type is printed on the old battery itself, but you cannot see it until the case is open. If you want to know before you begin, check your watch's original documentation or contact Fossil customer service with your watch model number. Fossil watches most commonly use CR2032 (the most common), CR2025, or SR626SW batteries. These are standard coin-cell batteries sold at pharmacies, grocery stores, electronics retailers, and online.

Buy the battery before you open the case. This way you have the right part on hand and can finish the job in one sitting. Coin-cell batteries cost $2 to $5 depending on where you buy them. Do not buy the cheapest option if the brand is unfamiliar—a quality battery from Energizer, Panasonic, or Duracell will last longer and is worth the small difference in price.

Gather the tools you need for a DIY replacement

You need three things: a case opener tool (also called a case back remover), your replacement battery, and optionally a small flathead screwdriver. The case opener is a flat metal pry tool with a notch designed to fit into the groove on the back of your watch case. You can buy one at a jewelry supply store, online, or sometimes at a watch repair counter for $5 to $10. Do not use a regular flathead screwdriver or a butter knife—these will slip and scratch the case.

If your Fossil watch has a screw-on case back (less common), you will also need a small screwdriver that fits the screws without stripping them. Most Fossil watches have a snap-on case back that requires only the case opener tool. Check your watch documentation or look at the back of your watch—if you see a groove all the way around the edge, it is a snap-on case. If you see screws, you will need the screwdriver.

Open the case back without damaging the watch

Place your watch face-down on a soft cloth or towel so the crystal (the glass face) does not get scratched. Locate the small groove or notch on the edge of the case back—this is where the case opener tool fits. Insert the flat end of the case opener into the groove and gently explore upward pressure. Do not force it; if it does not move, you may have the tool in the wrong spot or at the wrong angle.

Once you feel the case back start to lift, work your way around the edge, lifting a little at each point rather than prying hard at one spot. This spreads the force evenly and prevents the case back from bending or cracking. Once the case back is loose enough, you can usually lift it off by hand. Set it aside on the cloth where you can see it—you will need to put it back on in the same orientation.

If your watch has a screw-on case back, use the small screwdriver to remove each screw, working slowly so you do not strip the threads. Place the screws in a small container so you do not lose them. Once all screws are out, the case back will lift off.

Remove the old battery and install the new one

Inside the case, you will see the watch movement (the mechanical or electronic guts) and a small metal holder or clip holding a round coin-shaped battery. The battery sits in a shallow cup or under a small metal tab. Look at which side is facing up—the positive side (marked with a + symbol) should be facing toward you. Gently lift the old battery out using your fingernail or the edge of the case opener tool. Do not force it; if it is stuck, try lifting from a different angle.

Before you insert the new battery, check that it is the correct type by comparing it to the old one or to your documentation. Hold the new battery with the positive side facing up (the same orientation as the old one). Carefully place it into the holder, making sure it sits flat and is fully seated. You should hear or feel a small click as it settles into place. Do not force it—if it does not sit easily, you may have the polarity reversed or the wrong battery type.

Seal the case back and test your watch

Before you close the case, take a moment to look inside and make sure nothing has shifted or fallen out. The battery should be seated firmly in its holder, and no screws or small parts should be loose inside. Once you are satisfied, align the case back with the opening and press down firmly all the way around the edge until you hear or feel it snap into place. You may need to explore steady pressure for a few seconds. If your watch has screws, reinstall them in the same holes, tightening gently without over-tightening.

Once the case is sealed, press the crown (the button on the side of the watch) or any other buttons to make sure they still work smoothly. Set your watch to the correct time if it has stopped. If the watch does not start, try pressing and holding the crown for a few seconds—some Fossil watches have a power-saving mode that requires a reset. If it still does not work, the battery may be dead or installed incorrectly; open the case again and check the polarity and seating.

When to take your watch to a professional instead

If your Fossil watch is water-resistant (marked as "water resistant" or with a depth rating like "3 ATM" or "30M"), opening the case yourself will likely break the waterproof seal. A jeweler or Fossil retailer has the tools and gaskets to replace the battery and re-seal the case properly. This service usually costs $10 to $25 and comes with a warranty that your watch will remain water-resistant.

You should also take your watch to a professional if you are uncomfortable prying open the case, if the case back is stuck and will not budge, or if you are unsure about the battery type or polarity. A professional can also replace the battery while you wait at many Fossil stores and jewelry shops. If your watch is vintage, rare, or has sentimental value, a professional is the safer choice even if the DIY route would work.

Frequently Asked Questions

How long does a Fossil watch battery last?

Most Fossil watch batteries last two to three years under normal use. If you wear your watch every day, the battery may drain faster. If you wear it occasionally, it may last longer. Once the watch stops, the battery is almost always the problem.

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

Any CR2032 battery will work mechanically, but quality matters for longevity. Energizer, Panasonic, and Duracell batteries last longer and cost only slightly more than generic brands. Avoid very cheap batteries from unknown manufacturers—they may be counterfeit or have a shorter lifespan.

What if I open the case and the battery is a type I have never heard of?

Write down the battery code printed on the old battery (it will be something like CR2032 or SR626SW) and search for it online or take a photo to a pharmacy or electronics store. The staff can tell you if they have it in stock and what it costs. You can also contact Fossil customer service with your watch model number and they will tell you the correct battery type.

Will opening the case void my warranty?

If your watch is still under warranty, opening the case yourself may void it. Check your warranty documentation or contact Fossil before you open it. If the warranty is expired, you can open it safely. If the warranty is active and you are unsure, take it to a Fossil retailer or authorized jeweler instead.

My watch still does not work after I replaced the battery. What went wrong?

The most common causes are the battery installed backwards (positive side down instead of up), the wrong battery type, or a dead new battery. Open the case again, remove the battery, and check that the positive side is facing up. If it is, try a different new battery from a different package or brand. If the watch still does not work, the movement itself may be damaged and you will need professional repair.