Question about Casio G-Shock GW300CA-1V Wrist Watch

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You didn't have GW510A (limited edition) Assume this is similar?

Because its old battery was not holding a charge, I bought a new CTL1616 battery for my G-Shock GW510A. I need instructions on how to replace the old battery. Thanks for any help.

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It's a common problem, now that the earlier Tough Solar watches are getting on in years. Plus, there was apparently a bad production run by the battery manufacturer (Matsushita/Panasonic), so there's a certain subpopulation of G-Shocks that are seeing premature failure.

Replacement is easy. You'll need a jeweler's screwdriver set, ideally some plastic tweezers (though a toothpick will do), some metal tweezers for one of the final steps (but not for handling the battery), and if you're smart some latex gloves to keep everything pristine. Get a little tube of silicone grease, too (and ONLY silicone). Careful with it, though-- it's impossible to wash off of clothing, etc.

It's all proceed-at-your-own-risk, of course, but good instructions are posted at

Mind the little springs, and note which one came from where.

Altogether, it's an easy job. Good luck!

Posted on Apr 09, 2009



Take it to a repair shop.

Posted on Jan 23, 2008


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If you want to ensure you still have a the same water resistance rating, I do suggest that you take it to a watch guy to have it replaced for you. They clean switch contacts also and you keep water resistance rating. Good Luck and vote this as a "FixYa". Cheers


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