As a certified watch repair tech. I would not recomend changing your own battery. If you can get the back off there is a big chance that you will have difficulty getting the back back on. These watches are meant to be water resistance up to whatever level. When the case is open the seal is broken and needs to be either replaced or silicone needs to be added. This insures that your watch stays water reisitant and now that it is sealed the battery can have a longer life expectancy.
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