You can change a Timex Expedition battery yourself with basic tools in about 10 minutes

A Timex Expedition watch battery typically lasts two to three years before the watch stops. You do not need to send it to a jeweler or Timex service center — the battery compartment on most Expedition models opens from the back with a coin or small flathead screwdriver, and replacement batteries cost between $3 and $8. The whole job takes longer to find the right battery than to install it.

The process is the same whether your Expedition is digital or analog: pry open the case back, note the battery type printed inside, swap in a fresh battery of the same model number, and snap the case back closed. If your watch is water-resistant, you will need to replace the gasket (the rubber seal) at the same time to keep it that way — Timex sells gasket kits for $5 to $10.

Key Takeaways

  • Most Timex Expedition watches have a screw-off or snap-on case back that you can open with a coin or flathead screwdriver without special tools.
  • The battery type is printed on the inside of the case back or on the battery itself — common types are SR626SW, SR927SW, and CR2032.
  • You can buy replacement batteries at drugstores, supermarkets, electronics retailers, and online for $3 to $8 each.
  • If your watch is water-resistant, replace the rubber gasket at the same time to maintain the seal.
  • If the case back is glued shut or the watch is a vintage model, a jeweler or Timex service center is the safer choice.

What you need to open the case back

Gather a coin (a dime or penny works), a small flathead screwdriver, and a clean, flat surface like a table or towel. Some Expedition models have a case back with a slot for a coin; others have a small screw. Check the back of your watch first — if you see a slot, use the coin. If you see a screw head, use the screwdriver.

Do not use a knife or anything sharp that can slip and scratch the watch. A coin gives you control and will not damage the metal. If the case back has a small notch or groove all the way around instead of a slot or screw, it is a snap-on back — you can pry it open gently with a flathead screwdriver or a plastic spoon.

Keep the case back, gasket, and any small parts in a small dish or on a clean cloth so you do not lose them. Timex case backs are straightforward to misplace once they are off.

Finding the right battery type

Once the case back is open, look inside. The battery type is usually printed on the inside of the case back itself or stamped on the battery that is currently in the watch. Common Timex Expedition battery types are SR626SW (silver oxide, used in most analog Expeditions), SR927SW (larger silver oxide, used in some digital models), and CR2032 (lithium coin cell, used in some outdoor and digital models).

Write down the exact model number or take a photo with your phone. Do not guess — a battery that looks the same but has a different model number will not work, or will work for only a few weeks before draining. If you cannot read the printing clearly, remove the old battery and check the top and bottom of it.

Once you have the model number, you can buy the replacement at a pharmacy (CVS, Walgreens), a grocery store pharmacy, Best Buy, Walmart, Target, or online through Amazon or a battery retailer. Most places stock SR626SW and CR2032 in the watch or jewelry section.

Removing the old battery and installing the new one

Gently lift the old battery out of the compartment with your fingernail or a plastic spoon. Do not use metal tweezers or a screwdriver — you can scratch the inside of the watch or damage the battery contact. If the battery is stuck, tilt the watch slightly and let it slide out on its own.

Before you put the new battery in, look at the rubber gasket (a thin ring of rubber or silicone around the battery compartment). If it looks cracked, dried out, or flattened, replace it now. Timex sells gasket kits that include the correct size for your model — order by your watch model number, or ask at a jewelry counter. If the gasket looks fine, you can reuse it.

Slide the new battery into the compartment with the flat side facing up (the positive side). Make sure it sits flat and does not tilt. Close the case back by turning the coin or screwdriver clockwise if it is a screw, or by pressing down firmly if it is a snap-on. You should hear or feel a small click when it seats.

Testing the watch and replacing the gasket

Once the case back is closed, press the buttons on your watch or move it around to see if it powers on. Digital Expeditions should light up the display. Analog Expeditions should have the second hand moving. If nothing happens, open the case back again and check that the battery is sitting flat and making contact with both the top and bottom of the compartment.

If your watch is water-resistant (most Expeditions are rated to at least 50 meters), you should replace the gasket now if you have not already. The gasket is what keeps water out, and an old or compressed gasket will not seal properly even if the case back closes. Order a gasket kit for your specific Expedition model from Timex, a watch parts retailer, or Amazon. Installation takes two minutes — remove the old gasket, clean the groove with a dry cloth, and press the new gasket into place before closing the case back.

When to take your watch to a professional

If the case back will not open after gentle pressure with a coin or screwdriver, stop. Some older Timex Expeditions or special editions have case backs that are glued or sealed at the factory. Forcing it can crack the case or damage the watch. A jeweler or Timex service center can open it safely and will charge $15 to $30 for the battery replacement.

You should also take your watch to a professional if it is a vintage model (more than 20 years old), if it has a screw-down crown (a threaded knob at the side), or if you are not confident opening it. A jeweler can also replace the gasket and pressure-test the watch afterward to confirm it is still water-resistant.

Frequently Asked Questions

Can I use any battery that looks the same size?

No. Battery model numbers matter — SR626SW and SR927SW are both silver oxide but have different voltages and capacities. Using the wrong one will either not work or will drain much faster. Always match the exact model number printed on the old battery or case back.

How long does a new battery last in a Timex Expedition?

Most Timex Expedition batteries last two to three years with normal daily wear. Digital models with backlights or alarms may drain faster if you use those features often. Leaving the watch in a drawer unused does not extend battery life — batteries drain slowly even when the watch is not running.

Do I need to replace the gasket every time I change the battery?

Not every time, but you should inspect it. If it looks cracked, flattened, or dried out, replace it to keep the water resistance working. If it looks flexible and intact, you can reuse it. Gaskets typically last as long as the battery or longer, but moisture and age can degrade them.

What if the watch still does not work after I put in a new battery?

Open the case back and check that the battery is sitting flat with no tilt. Make sure the positive side (flat side) is facing up. If it is seated correctly and the watch still does not work, the battery may be defective — try a different new battery from a different package. If that does not work, the watch may have an internal problem, and a jeweler should look at it.

Is it safe to change the battery if my watch is water-resistant?

Yes, as long as you replace the gasket at the same time. The gasket is what seals the case back and keeps water out. If you open the case back and do not replace the gasket, the watch will lose its water resistance. Always order a gasket kit for your specific Expedition model before you open it.