How to Replace a Seiko Watch Battery

Known for their amazing accuracy and little maintenance, Seiko quartz timepieces are a popular choice. Unlike automatic watches, quartz watches have a battery that powers the movement. Eventually all batteries will reach the end of their life and need replacing.

Luckily, replacing a Seiko watch battery is usually rather simple, with the right equipment and the right precautions. But if you open the casing the wrong way or use the wrong battery you could ruin the watch or undermine its water-resistance.

In this post I’ll show you how to change a Seiko watch battery, when to change it and whether to do it yourself or get a professional to do it for you.

Looking for a maintenance free alternative? Read more in our Best Seiko Solar Watches Under $500 USA Guide .

Does Every Seiko Watch Use a Battery?

No.

Seiko produces several types of watches:

Watch Type	Power Source
Quartz	Disposable battery
Solar	Rechargeable solar cell
Automatic	Wrist movement
Kinetic	Rechargeable capacitor/power cell

Only quartz models require regular battery replacement.

How Long Does a Seiko Watch Battery Last?

Battery life varies on movement and watch characteristics;

Average lifespan:

• Basic quartz watches 2 to 5 years
• Chronograph models: 2-3 years.
• Alarm watches: 2-3 years
• Digital watch: 3 to 7 years (depending on usage)

Frequent usage of the alarm, backlight or chronograph may reduce battery life.

When it’s time to replace your battery

Typical indicators are:

• Watch stopped dead
• End-of-Life indicator on some models) Second hand jumps every 2 seconds
• Digital display fades
• Alarm is feeble
• Backlight dimming
• Timekeeping goes awry

If you see these symptoms, change the battery as soon as possible.

Tools You Will Need

Before you begin, gather:

• Case back opener (suitable for your case type)
• Small precision screwdriver.
• Plastic tongs
• Replacement battery (model accurate)
• Microfiber cloth (soft)
• Gloves or finger cots (optional)
• Silicone gasket grease (optional if re-sealing)

Work on a clean, properly illuminated surface so you don’t lose little bits.

Step 1: Identify the Battery Type

All Seiko quartz movements use the same battery.

Before you purchase a replacement:

• Refer to the owner’s manual.
• Check out the back of the case.
• Write down the current battery number.

Never presume that the batteries are interchangeable.

Using an incorrect battery may harm the movement.

Step 2: Open the Case Back

Seiko watches come in one of three case back styles:

Snap-On Case Back

Carefully open using a case knife.

Screw-Down Case Back

Unscrew it with a Proper Case-back Wrench.

Screw-Back with Small Screws

Using a precision screwdriver, remove each screw.

Allow plenty of time so you don’t scratch the case.

Step 3: Find the Battery

In the watch you will see:

Battery

Hold down clip, battery

Movement Quartz

Rubber Seal

Before you remove any batteries, take a picture of how the batteries are oriented.

This will make the reassembly much easier.

Step 4: Take Out the Old Battery

Carefully release the retaining clip.

Lift the battery using:

• Plastic tweezers
• Non-metallic tool

Avoid using metal tools whenever possible.

Metal tweezers can accidentally short the battery.

Step 5: Replace the New Battery

Install the new battery in the same way the old one was installed.

Make sure:

Correct polarity (+/−)

• Dead battery
• Clip locks retained securely

Don’t force the battery into place.

Step 6: Check the Gasket

The water is kept out by the rubber gasket.

Before you close the watch:

Look for:

• Cracks.
• Dirt
• Driness
• Damage

Replace gaskets that are damaged if necessary.

A little silicone gasket lubricant helps to maintain a good seal.

Step 7: Close the Case Back

Step 10 Reinstall the cover using the reverse procedure.

Make sure:

• Clicks snap back equally.
• Screw-back is tightly screwed down.
• Screws tight, but not too tight.

Water resistance can be reduced by improper sealing.

Step 8: Reset the Watch

When the battery is fitted:

• Set the right moment.
• If applicable, set a date.
• Test the alarms or chronograph features.

Your watch should immediately begin to work.

Can you change the battery yourself?

Yes – if you have:

• The right tools
• Watch repair experience basic
• A clean work space

However, professional replacement is often suggested for:

• Diving watches
• High-end models
• Water resistance testing for watches
• Seiko timepieces, classic

Do you need to change the gasket?

If the watch is regularly exposed to water, it is a good practice to replace or inspect the gasket at the time of battery replacement.

A damaged gasket might let moisture get into the case and perhaps damage the movement.

Common Errors to Avoid

Incorrect battery

The number on the battery must match exactly.

Touching the Movement

Don’t touch any gears or electronic components.

Getting Small Parts Lost

Work over a tray or cloth so screws and clips do not roll away.

Harming the Gasket

Do not pinch or twist the gasket when closing the case.

Disregarding Water Resistance

Once the case is opened, the original water-resistance seal may not be 100% reliable any more. If you swim or dive a lot with the watch you may want to have the water resistance tested by a professional.

Should you go to a professional?

If you: professional battery replacement is usually the better option if:

• Your watch remains under warranty.
• It’s a nice Seiko.
• It features a screw-down cap and it is quite water resistant.
• You don’t know anything about watch repair.

The professional service is much cheaper than repairing the damage caused due to improper battery replacement.

Tips to Increase Battery Life

For the best battery life:

• Avoid extreme temperatures for the watch.
• Avoid unnecessary alarms and lights.
• Replace the battery when it is exhausted.
• Do not get the watch wet or soil it.

Battery vs Solar vs Automatic

Feature	Quartz Battery	Solar	Automatic
Power Source	Battery	Light	Wrist movement
Battery Replacement	Yes	Rarely	No
Accuracy	Excellent	Excellent	Very Good
Maintenance	Low	Very Low	Moderate

Each movement has advantages, depending on your lifestyle and preferences.

The Last Word

Replacing the battery in a Seiko quartz watch is a fairly straightforward maintenance procedure, as long as you have the right tools and batteries. Open the case gently, take care of the gasket, and fit the battery correctly to make sure your watch keeps time accurately.

If your watch is very water resistant or has sentimental significance, then it can often be worth the tiny additional expense of professional battery replacement for peace of mind.

Frequently Asked Questions

How often should I replace a Seiko watch battery?

Most Seiko quartz watch batteries will last 2 to 5 years depending on the movement and features.

Can I replace the battery myself?

Yes, if you have the right tools and experience. Otherwise, it should be replaced by a professional.

Why is my Seiko still not working after replacing the battery?

Possible causes include: wrong battery, bad battery contact, dead rechargeable battery (for Solar or Kinetic models), or a movement that needs service.

Does replacing the battery affect water resistance?

It might. When the case is opened the gasket can be damaged or not properly reseated, compromising the seal. If the watch is used in moist situations it should be examined for water resistance.

Do Seiko Solar watches need battery replacement?

No, Seiko Solar watches do not use a disposable battery, but a rechargeable power cell which is charged by light.