Turn the watch over and do one of the following:
For Touch or Fun Scuba watches: Locate the small indent under the battery cover, insert a corner of the tip of the screwdriver into the indent, and then pop the battery cover off.
For Skin watches: Slide the tip of the screwdriver under the battery cover and pop the battery cover off.
For all other models: Insert the tip of a flat-head screwdriver into the slot above the + sign and turn the battery cover counter-clockwise about 1/8 of the circumference of the watch.
Remove the battery and look for a three-digit number, such as 390, on the battery case.
Shop for a battery. For example, to find your battery online, search for “390 watch battery.”
Put the new battery in the watch plus (+) side up.
Replace the battery cover. Use a flat-head screwdriver to screw a metal cover back into place. The plastic covers snap into place.