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How to, step by step instructions to replace the battery on this Seiko Sportura quartz chronograph. Topics covered include opening the caseback, removing and inserting the battery (in this case a Renata 399), removing, replacing and re-lubricating the caseback gasket, closing the caseback, and resetting the chronograph center seconds hand and accumulated minute hand back to zero.
I'm Colin Potts, owner of Watch off the Cuff in Milton, ON Canada, a boutique watch repair company that repairs watches, sells new and vintage watches and watch parts, and also provides technical resources, watch articles and more:
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