Cardinal is a watch maker that makes all sorts of watches. Most of these watches use small batteries that can be easily changed so long as you have the right tools. Before you get started, take a look at the type of watch you have because some of them have the backs screwed on with four tiny screws while others do not. If you have the screw-on type, then you will need extra tools to change the battery in your Cardinal watch.
Flip the watch upside down so that you can take a look at the back of the watch.
Unscrew the screws holding the back in place with a small screwdriver. If there are no screws holding the back in place, then you should skip this step. Place the screws in a safe location as they are very small and can easily be lost.
Pop up the back of the watch with a case knife so that you gain access to the inside of the watch.
Pop out the battery with the case knife.
Insert the new battery. Pop the back of the watch back into place.
Screw the screws back onto the watch if the watch had screws. If not, then skip this step.