Dive Computer Maintenance Checklist: Battery, O-Rings, and Calibration

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-ring when you open the case, and use only silicone-based grease like Dow Corning DC-4 or Christo-Lube MCG-111 to keep it supple and properly seated. Torque battery caps to just one-eighth to one-quarter turn past finger-tight; over-tightening crushes o-rings and can crack plastic threads. Inspect o-rings every six months under good lighting, feeling for hardness or brittleness that indicates degradation even when they look fine visually. Never attempt DIY battery replacement on air-integrated computers—these require pressure testing to 300+ meters and professional calibration to avoid costly flooding. After any battery replacement, test the depth sensor in shallow water to catch calibration issues or faulty installations before your next real dive. Read the full article: https://thescubagearlab.com/dive-computer-maintenance-checklist