I see places that offer battery changes for around $5. and wonder how they make money. Makes me wonder about the quality of the battery. So I was thinking about changing my own and need some tips. For one what type of caseback is the easiest. A caseback that you pry open I would think you need some type of tool to press it back on correctly. And the caseback that screws on, how do you know when it is tight enough and what is the best tool for that one. The ones that have screws I imagine you just tighten down snug. Any tips for the gshock. the other advantage of doing it yourself I think is that when it goes you can change it immediately at home vs finding a place especially if it happens late at night or on the weekend.