You are going to have to remove the battery to find out which one you need. For instructions on how to do this see: http://www.mademan.com/mm/fossil-watch-battery-replacement-guide.html. You can buy the battery at: http://shop.batterymart.com/search#w=fossil%20ch2599%20watch%20battery. Replacing a Fossil battery is delicate and tricky. Fossil recommends that you send it to a shop that specializes in Fossil watch battery replacements.
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You are going to have to remove the battery to find out which one you need. For instructions on how to do this see: http://www.mademan.com/mm/fossil-watch-battery-replacement-guide.html. You can buy the battery at: http://shop.batterymart.com/search#w=fossil%20ch2599%20watch%20battery. Replacing a Fossil battery is delicate and tricky. Fossil recommends that you send it to a shop that specializes in Fossil watch battery replacements.