How long do dive computer batteries last?

Three patterns: user-replaceable coin cells (1–2 years or ~100–300 dives — Zoop Novo, Leonardo class), rechargeables (30–60 dive-hours per charge — Peregrine, Teric), and solar-assisted (Descent G1 stretching weeks between top-ups). Rechargeables mean packing a charger on liveaboards; coin cells mean a $10 service ritual. Check the battery pattern before you buy — it shapes trip logistics more than screen specs do.