Open watch case back, then release the metal contact covering the battery. Memorize battery's polarity (+ up and - down), then take the battery out. Memorize the combination of letters and numbers on battery (should be something like: CR 3216 or similar). Make does not matter - Seiko is as good as Maxell, Panasonic and other reputable makes. Buy new battery with identical combination of letters and numbers and put in your watch. Replace back contact, gasket and case back. Set your watch and enjoy. Rate me, please.
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