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According to their site, they don't want you replacing the battery. The battery is a silver oxide type, and the number is sr927W. You can find one with a google search. I'm including a link to a youtube video for 320, which might be close enough. If it is, you'll need a tool they mention that they say costs $6 How to change the battery on Casio AMW 320R watch
mcdevito75 here, Casio uses an LCD crystal, Liquid Display Crystal, during a battery change any, any un do pressure remopveing or replaceing the battery could destroy the LCD. Take my advise, with a casio watch, look for a small watch repair shop in your area for the battery change. I"ve ruined many of my casio watches during battery change.
mcdevito75 here, I've also riuned a number of Casio watches replaceing the battery, extra, extra care is needed, first remove the back cover screws, then you:ll have to remove another cover for the battery, after replaceing the battery the work begins, very carefully reverse the removal procedure, any un do pressure will cause the movement to break and the face of your watch will turn Black. Best with your casio is to let a watch repair shop change the battery, look for a small shop to save some money.