Replacing the Battery Is a Snap
It would be a serious shame to set your watch aside for days at a time just because the battery died. The process of replacing a watch battery is actually quite simple, and the sooner you make the switch the more use you’ll get out of your timepiece. Place the watch face-down on a soft linen so that the surface doesn’t scratch. You’ll probably notice a tab to pull or an indentation to turn on the back of the watch.
You might find that the watch is restrained by a bracket or some similar component, which might require the use of a screwdriver to loosen. Once that barrier is removed, tap the watch face lightly to send the lithium watch battery tumbling out. Simply reverse this process to install the new battery. Ask a jeweler or local hobbyist about replacing a waterproof watch battery as these are much trickier.