If you don't have the proper tools I recommend that you not do this yourself. You could scratch the case or damage the movement if you don't know what you're doing. If it's a water resistant watch the gasket also needs to be replaced once it is opened. DO NOT reuse a gasket! For about $8 any watch or jewelry store can change the battery and renew the gasket for you.
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need to replace watch battery, what size battery ?
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