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.

How to Replace the Battery in a Watch Remove the back of the watch. Most new watches feature snap-off rear panels with little indentations to assist you peel the cover off properly. Remove the gasket and set it to the side. Locate the battery and remove it. Replace the battery. Examine your work. Replace the gasket and keep an eye on things.

Remove the battery with gloves and clean the battery compartment with a toothbrush and vinegar. After drying, new batteries can be inserted into the device.