How To Change Battery In A Timex Watch

Learning how to change battery in a timex watch is a straightforward task you can often do at home. A successful Timex watch battery change hinges on using the correct size screwdriver or case tool. With a few basic items and some careful attention, you can save a trip to the jeweler and get your favorite watch ticking again quickly.

This guide provides clear, step-by-step instructions for the most common Timex watch case types. We will cover the tools you need, how to open the watch, safely swap the battery, and reseal it properly. Let’s get started.

Before you begin, it’s crucial to understand that Timex watches use several different case designs. The method for opening the watch back depends entirely on which type you have. Using the wrong technique can damage the case, so identifying your watch’s back is the first and most important step.

Gather your materials on a clean, well-lit workspace. A soft cloth or towel is recommended to place under the watch to prevent scratches and to catch any tiny screws.

Essential Tools And Materials You Will Need

Having the right tools makes the process smooth and prevents damage. Here is a basic list of what you should assemble:

A set of precision screwdrivers (especially JIS #000 or #00 for screws)
A case opening tool or a set of case knives
A pair of non-magnetic tweezers
A soft cloth or pad
A magnifying glass or loupe (helpful for seeing small parts)
The correct replacement battery (we’ll cover how to find this next)

Identifying Your Timex Watch Case Type

Timex watch backs generally fall into three categories: snap-off backs, screw-off backs, and screwed-on backs. Look closely at the back of your watch to determine which one you have.

Snap-Off Or Press-On Case Backs

This is a common style for many Timex watches. The back is a single piece of metal that is pressed onto the watch case. You will see a very thin, uniform seam around the edge. There are no notches or screws visible. These require a case knife or a specific pry tool to open.

Screw-Off Case Backs

These backs have small notches or indentations around the edge, usually at opposite sides. They are threaded and unscrew from the watch case. You need a case wrench or a rubber ball tool that fits these notches to get enough grip to turn it.

Screwed-On Case Backs

This type uses small, visible screws to hold the back plate onto the watch. You will see four to six tiny screws on the back surface. These require a precision screwdriver to remove. Be very careful not to strip the screw heads.

Finding The Correct Replacement Battery

Using the wrong battery can damage your watch’s movement. The safest way to find the correct battery is to check the old one once you have the case open. The battery type will be printed on its surface (e.g., 371, 377, 364).

If you need to buy the battery beforehand, you can often find the reference number in your watch’s manual. Alternatively, search online using your watch’s specific model number, which is usually engraved on the case back. Popular Timex battery types include SR626SW, SR621SW, and SR920SW.

Step By Step Battery Replacement Guide

Now, let’s walk through the process for each primary case type. Work slowly and keep track of all components.

Opening A Snap-Off Case Back

Place the watch face-down on a soft cloth.
Insert a case knife or a thin, flat pry tool into the seam between the case and the back.
Apply gentle, upward pressure to pry the back open. You may need to work your way around the edge, prying a little at a time.
Once the back pops off, set it aside carefully.

Opening A Screw-Off Case Back

Place the watch on the soft cloth.
Select a case wrench with pins that match the notches on your watch back, or use a sticky rubber ball.
Press the tool firmly onto the back to engage the notches or get a good grip with the rubber ball.
Turn the tool counter-clockwise to unscrew the back. It may require some force initially.
Once loose, you can unscrew it by hand and remove the back.

Opening A Screwed-On Case Back

Identify the correct screwdriver size. The screws are very small, so a #000 or #00 driver is typically needed.
Place the watch securely on the cloth.
Carefully unscrew each screw, applying steady downward pressure to avoid slipping.
Place each screw in a small container so they don’t get lost.
Once all screws are removed, lift off the case back.

Removing And Replacing The Battery

With the case back off, you can now access the movement. Be mindful of dust and moisture; try to complete this step quickly.

Locate the battery. It will be a small, silver disc held in place by a small metal clamp or sitting in a plastic compartment.
If there is a metal clamp, you may need to gently lift one side with tweezers or a small screwdriver to release the battery.
Use non-magnetic tweezers to carefully lift the old battery out. Note its orientation (which side is facing up).
Before inserting the new battery, check the battery compartment for any corrosion or debris. Gently clean if necessary with a dry cotton swab.
Insert the new battery with the correct side facing up (the positive side usually has the battery number printed on it).
If you removed a clamp, press it back into place to secure the new battery.

Reassembling Your Timex Watch

This is just as important as opening it. A proper seal keeps dust and moisture out.

For snap-off backs: Align the back with the case and press firmly around the edges with your thumbs until you hear a distinct click. Ensure it is seated evenly all around.
For screw-off backs: Align the threads and screw the back on clockwise by hand first. Then use your case wrench or rubber ball to tighten it snugly. Do not overtighten.
For screwed-on backs: Place the back plate on the watch and insert all screws loosely first. Then tighten each screw a little at a time in a cross pattern, like tightening a car wheel, until they are all snug.

Once the back is secure, set the time and date if your watch has those functions. Your watch should now be running perfectly.

Safety Tips And Common Mistakes To Avoid

Avoiding these common errors will ensure a successful battery change and protect your watch.

Never use excessive force. If something won’t budge, reassess your tool or technique.
Avoid using magnetic tools near the watch movement, as they can affect its accuracy.
Do not touch the movement or the new battery with your fingers. Skin oils can cause issues. Use tweezers.
Ensure the gasket (the small rubber ring around the case back) is clean and in good condition. If it’s cracked or brittle, it should be replaced to maintain water resistance.
Keep your work area organized to prevent losing tiny screws or components.

When To Seek Professional Help

While many Timex watches are simple to service, some situations warrant a visit to a professional watch repair technician.

If the case back is severely stuck or corroded and will not open.
If you see visible damage to the movement or corrosion around the battery compartment.
If you have a high-end or water-resistant Timex watch, as improper resealing can compromise its integrity.
If you are uncomfortable with any step of the process. A professional job is often inexpensive for basic battery replacement.

Frequently Asked Questions

Here are answers to some common questions about changing a Timex watch battery.

What Battery Does My Timex Watch Use?

The specific battery type varies by model. The most reliable method is to open the watch and check the number on the old battery, such as 371 or 377. You can also consult your watch’s manual or look up the model number online.

Can I Change A Timex Watch Battery Myself?

Yes, for most basic Timex models with snap-off or screw-off backs, you can change the battery yourself with the proper tools. If your watch has a complex case or you lack confidence, a jeweler can do it quickly.

How Long Does A Timex Watch Battery Last?

A typical Timex watch battery lasts between 2 to 5 years, depending on the model and its features. Watches with alarms or backlights may consume battery power more quickly.

How Much Does It Cost To Replace A Timex Battery?

If you do it yourself, the cost is just the price of the battery, usually between $3 and $10. Having it done professionally at a jeweler or watch shop typically costs between $10 and $25, including the battery and labor.

Why Is My Timex Watch Not Working After A Battery Change?

If your watch doesn’t start after a new battery, first double-check that the battery is inserted correctly with the right side up. Ensure the battery clamp is securing it properly. If it still doesn’t work, there could be a issue with the movement or the new battery itself could be faulty. Re-check your work or consult a professional.