Your dive computer handles life-critical decompression calculations on every dive, yet most divers ignore basic maintenance until a low battery warning flashes during a boat briefing. In this episode, Ray Hollister draws on over eight thousand dives and decades of experience to walk through the essential maintenance checklist that keeps your computer reliable when it matters most. Whether you're running a user-replaceable coin cell or a rechargeable lithium-ion unit, you'll learn exactly when to service what—and why cutting corners on three-dollar o-rings can destroy a thousand-dollar computer.

• Replace user-serviceable batteries annually or every 100–150 dives, whichever comes first—don't wait for the low battery warning, which means you're already operating on borrowed time.

• Always swap the battery compartment o ...