how do i know what type of battery i need for my watch?
If none come up in the search that are model-specific and contain the battery size, proceed to the next step. Remove the back of the watch to look at the numbers on the battery directly. You may need a knife to wedge the back off, since the gap between the watch back and the rest of the body is usually very slender. A screwdriver will almost never be narrow enough to fit into the gap.