You can replace a Timex watch battery yourself with basic tools in about 10 minutes

Most Timex watches use a standard coin-cell battery that you can swap out at home without special training. The process involves opening the case back, removing the old battery, and installing a new one—all with tools you likely have in a drawer. The hardest part is usually opening the case without scratching it, not the battery swap itself.

The entire job takes longer to set up than to perform. You'll need a case opener (a flat tool designed for watch backs), the correct replacement battery, and a clean, well-lit workspace. If you don't have a case opener, a butter knife or flathead screwdriver works in a pinch, though it carries more risk of slipping and damaging the watch.

Key Takeaways

  • Timex watches typically use CR2032, CR2025, or SR626SW batteries depending on the model—check your watch manual or the old battery itself to know which one to buy.
  • You need a case opener tool (under $5 at any pharmacy or watch supply site) to safely pry open the case back without scratching the watch.
  • The battery sits in a small metal holder; note which side faces up before you remove it, then install the new battery the same way.
  • Avoid touching the battery with bare fingers, as skin oils can reduce its lifespan—use a clean cloth or the tweezers that often come with battery kits.
  • If the case back is sealed with a rubber gasket, replace it during reassembly to keep water out of the watch.

Find the correct battery size for your Timex model

The first step is knowing which battery your watch needs. Look at the back of your watch case—many Timex models print the battery type directly on the case back. Common sizes are CR2032 (the most frequent), CR2025, or SR626SW. If you don't see it printed there, check the instruction manual that came with the watch, or search online for your specific Timex model number.

If you've already opened the watch, the easiest route is to look at the old battery itself. The type and size are stamped on it. Take a photo of the old battery before you remove it, or write down the number. This takes the guesswork out of buying the replacement.

Buy your replacement battery from a pharmacy, drugstore, supermarket, or online retailer. Batteries cost between $3 and $8 depending on the type. Avoid the cheapest generic brands if you can—name brands like Energizer, Duracell, or Panasonic last longer and are worth the small difference in price.

Gather your tools and set up your workspace

You need three things: a case opener, the replacement battery, and a clean, flat surface with good light. A case opener is a small flat tool with a notch designed to fit into the groove on the watch case back. You can buy one for $3 to $8 at any pharmacy, drugstore, or watch supply website. Search for "watch case opener" or "watch back opener."

If you don't have a case opener, a flathead screwdriver or butter knife can work, but the risk of slipping and scratching the watch is much higher. A case opener is cheap enough that it's worth buying if you plan to do this more than once.

Set up on a clean table or counter with good overhead light or a desk lamp. Lay down a soft cloth (an old t-shirt works fine) to catch the watch if you drop it and to prevent small parts from rolling away. Have tweezers or a small clean cloth nearby—you'll use one to handle the new battery without touching it with your fingers.

Open the case back without damaging the watch

Look at the back of your watch. You'll see a thin groove running around the edge of the case back. This groove is where the case opener fits. Insert the flat end of the case opener into the groove, positioning it so the notch catches the edge of the case back.

Once the opener is seated in the groove, explore steady, gentle pressure and twist it slightly—think of it like opening a paint can, not like forcing a stuck jar. The case back should pop up slightly. If it doesn't move after light pressure, try a different spot on the groove. Sometimes one spot is easier than others.

Once the case back lifts enough to grip, use your fingers to pry it the rest of the way off. Set it down on your cloth in a safe spot where you won't lose it. If the case back has a rubber gasket (a thin rubber ring) attached to it, leave it in place for now—you'll reinstall it when you close the watch.

Remove the old battery and note its position

Inside the watch, you'll see the battery sitting in a small metal holder or clip. Before you touch it, look at which side is facing up. The positive side (marked with a + symbol) usually faces up, but not always. Take a mental note or snap a quick photo. This matters because installing the new battery upside down will prevent the watch from working.

Use tweezers or a clean cloth to lift the old battery out of its holder. Don't touch the new battery with your bare fingers—skin oils can reduce its lifespan. If you don't have tweezers, use a small piece of clean cloth to handle it.

Once the old battery is out, you can see the holder clearly. It's usually a small metal clip or cup. Make sure nothing is blocking it and that the holder itself isn't bent or damaged. If the holder looks bent, you may need to take the watch to a professional to have it straightened before the new battery will sit properly.

Install the new battery and close the case

Place the new battery into the holder with the same side facing up as the old one was. If the positive side faced up before, the positive side of the new battery should face up now. Press it down gently until it sits flat in the holder and clicks into place. The battery should not move when you nudge it lightly.

Before you close the case back, press the crown (the button on the side of the watch) a few times to see if the watch powers on. If you see the second hand move or the display light up, the battery is installed correctly. If nothing happens, remove the battery, flip it over, and try again.

Once the watch is working, pick up the case back and check the rubber gasket. If it's still attached and looks clean and flexible, you can reuse it. If it's cracked, dried out, or missing, you should replace it with a new one before closing the watch—this keeps moisture out. Gaskets cost $2 to $5 and are available wherever you buy batteries.

Align the case back with the watch body and press it down firmly until it clicks into place. You should hear or feel a small snap. Wipe the back of the watch with a clean cloth to remove any fingerprints or dust.

Test the watch and troubleshoot if it doesn't work

Wear the watch for a few minutes and check that the second hand is moving smoothly and the display (if it's digital) is showing the correct time. If the watch is working, you're done. The new battery should last between two and five years depending on the model and how often you use features like the backlight.

If the watch doesn't work after you close it, open the case back again and check three things: Is the battery installed with the correct side facing up? Is the battery sitting flat in its holder, or is it tilted? Is the metal holder itself clean and free of corrosion or debris?

If the battery is installed correctly but the watch still doesn't work, the problem may be with the watch itself, not the battery. Try a fresh battery from a different package to rule out a defective battery. If a second battery doesn't work, the watch may need professional repair—the circuit board or contacts inside could be damaged.

Frequently Asked Questions

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

Any CR2032 will fit and work, but name brands like Energizer, Duracell, and Panasonic last longer than generic store brands. The price difference is usually $1 to $2, and the longer lifespan makes it worth buying the better battery. Avoid batteries from unknown sellers online.

What if I can't get the case back open?

Try a different spot on the groove—sometimes one section is easier than others. explore steady pressure rather than sudden force. If you're still stuck after trying several spots, take the watch to a pharmacy or jewelry store; most will open it for free or a small fee, and you can do the battery swap yourself once it's open.

Is it bad to touch the battery with my fingers?

Skin oils can reduce battery lifespan slightly, but it won't ruin the battery or prevent the watch from working. If you touch it by accident, just wipe it clean with a cloth before installing it. Using tweezers or a cloth is better practice, but not critical.

How do I know if the rubber gasket needs to be replaced?

Look at the gasket after you open the case. If it's cracked, hard and inflexible, or visibly deteriorated, replace it. If it's still soft and flexible with no visible damage, you can reuse it. A new gasket costs $2 to $5 and keeps water out of the watch, so it's worth replacing if you're unsure.

Why isn't my watch working after I put in the new battery?

The most common reason is the battery is installed upside down. Open the case back and flip the battery over. If that doesn't work, check that the battery is sitting flat in its holder and not tilted. If both of those are correct, try a fresh battery from a different package to rule out a defective battery. If a second battery doesn't work, the watch may need professional repair.