You had to have a knife caseback opener or any flat tools. look for the small opening on the back located on the upper right side of the caseback, insert the flat tool inside of it and just flip it up. then it pops out. note: after you had change the battery, you had to use pressing tools to cover it again because it cannot press by hands to seal it. it uses CR2016 size of battery. i hope i had been helped you.
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