Seiko Watch Battery Replacement Guide

In this guide, we will explain how to replace a Seiko watch battery. It does require some tools, but it should not take a long time. Make sure to work very carefully to prevent additional damage to your watch. 

If you’d prefer to leave the battery replacement to the experts, many opt to use our Seiko mail-in watch battery replacement service. You can request a free, printable shipping label to mail your watch to our service center.

If you feel comfortable performing the process on your own, follow the steps below to learn how to change a Seiko watch battery. Before continuing, make sure your watch is not a solar watch.

If it is, we recommend delegating to the experts for Seiko solar watch battery replacement. This rechargeable battery is actually a special cell called a capacitor, which should be replaced by a trained watchmaker.

Seiko Watch Battery Replacement

1. Open the Back of a Seiko Watch

First, we will need to remove the back of your Seiko. Most Seiko watches generally have a back case with multiple indentations. You’ll want to use an adjustable watch case opener to safely open your watch. 

Adjust the size of the watch opener to fit around the back shell of the watch. Line up the nobs with the indentations of the case, and twist the cover off.

If your watch only has one small indentation on the back case, it’s likely a hinge case. You’ll need to use a common cover remover, insert the edge into the slot, and lift the case up.

2. Find the Battery Size of a Seiko Watch

Now you’ll be able to view the inner components of the watch. With a magnifying glass, see what type of battery powers your Seiko. Seiko battery replacement sizes are usually a 371 (SR920SW, a 377 (SR626SW), or a 303/357 .

We recommend using a quality brand such as Duracell or Renata for replacement batteries for Seiko watches. At our repair center, we stock all Seiko battery sizes – as well as dozens of other sizes.

3. How to Replace the Watch Battery in a Seiko

Inside certain Seiko watch models, there is a clip over the battery that holds the cell in place. The clip may be screwed or pinned over the top. If there is a clip, carefully remove or loosen it. 

Once the battery is accessible, insert your tool of choice into the opening. Slowly ease the old battery from the casing. Unpackage your new battery and replace.

Gently press the new battery into position, and reclip if necessary. Make sure not to nick any other mechanisms inside the watch, as this can cause more serious, auxiliary damage. 

Before closing the back cover, make sure the watch is functional. If it is not, you may have installed the battery incorrectly, or there may be additional damage to the watch. If you cannot get the watch working properly, you can mail it to our service center for a complete inspection.

4. Secure the Cover Back on the Seiko Watch

Now that your watch is functioning properly, you can close the case with the same adjustable tool. Make sure to tighten it securely, especially if your watch is water resistant.

If your watch has a hinge case, you can press the case back on with your thumbs. It will need considerable pressure, and you will feel a click when it is secure. If you’re unable to, we recommend a watch press set to ease the process.

We hope this guide has helped you learn how to change a battery in a Seiko watch. If you are having issues, please feel free to request a shipping label. We provide a variety of Seiko watch repair services, including battery replacements, watch movement services, rubber gasket replacements, watch face crystal replacements, band repairs, and more. Contact an authorized Seiko repair specialist with