Dive Computers & Electronics
Battery Type — What It Is and Why It Matters
Dive computers use various battery types depending on their design and power requirements. Common options include user-replaceable CR2450 or CR2032 coin cells (found in many Suunto and Cressi models), proprietary rechargeable lithium-ion batteries (Shearwater, Garmin), and AA or CR123A cells in some console units. Battery choice affects dive computer design, running costs, and field serviceability.
Rechargeable batteries offer convenience and lower long-term cost but require access to a charger between dive trips. User-replaceable batteries can be swapped in the field but require careful O-ring maintenance during battery changes to maintain the computer's depth rating. Some manufacturers require dealer battery service to preserve the warranty.
Frequently Asked Questions
How often do dive computer batteries need replacing?
User-replaceable coin cell batteries typically last 1 to 3 years or 100 to 300 dives, depending on usage, backlight settings, and air integration. Rechargeable batteries usually last 20 to 40 hours of dive time between charges.
Can I change my own dive computer battery?
On models with user-replaceable batteries (many Suunto, Cressi, Oceanic units), yes — kits include the battery and a fresh O-ring. On sealed rechargeable units (Shearwater, Garmin), the battery is not user-serviceable. Always follow the manufacturer's instructions to maintain the waterproof seal.
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