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It's quite easy to do, but as there is a Seiko Service Centre nearby, I like to take my GS and Tunas in for the battery change. It costs $40 but you get a pressure test (up to 10 bar) included and a some official paperwork to throw in the box. My SBGT235 is due to start the three-yearly two-second-jump battery alert any day now, and it's only gained about six seconds since the last change. Kinda looking forward to going in and checking out the display cases and picking up some catalogs.
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