If your timex indiglo watch is losing time, it’s a good indication that your battery is at the end of its life. Although Timex watches come in a wide range of styles and models, the basic process for changing the battery remains the same.

If you don’t already know what size battery you need, you can find this information on the back plate of your watch. Once you have your replacement battery, you will need to open the back of the watch to gain access to the battery compartment. Depending on the watch, the back plate will either screw off or be attached by a few small screws. If attached with screws, you will need a set of precision screwdrivers such as a jewelry or eyeglass kit.

Inside the battery compartment, you will see the battery is held down by a clip. Carefully remove the clip and eject the battery. Insert the new battery and replace the clip. If the battery clamp indicates you should do so, quickly press the reset button twice. Then reattach the back of the watch. If the watch display remains off after replacing the battery, press all buttons at the same time to reset the display.

With all the features on a Timex Indiglo watch, the battery tends to drain a lot faster than the 4.5 years that Timex estimates for battery life. If you want to make your new battery last as long as possible, avoid using the special functions when they aren’t necessary. Turn off the alarm on days you don’t need it. Don’t use the Night-Mode setting during the day. Night-Mode causes the Indiglo light to activate for three seconds any time you push a button.

Dispose of your old battery responsibly and never put a battery in a fire. Watch batteries are not rechargeable. Since watch batteries are so small, it is advisable to keep them away from children as they are a choking hazard.

Changing the battery in your Timex watch yourself will void your warranty and is done at your own risk. Timex recommends having a retailer or jeweler replace the battery.