Garmin Epix Pro Gen 2 51mm

Two design choices stack against this watch. First, the 82-hour figure is a single-band GPS number — the thriftiest positioning mode Garmin offers. Switch to the multi-band accuracy most buyers actually use on technical terrain and the power draw climbs steeply. Second, this is an AMOLED watch built on a comparatively small 1900 mWh cell — smaller than the MIP-screened Fenix 8's 2400 mWh. A brighter, hungrier display drawing from a smaller reservoir, with a claim measured on the most favourable GPS mode: the gap was engineered into the spec sheet before the watch ever left the wrist.

The titanium case compounds the problem. Under wind exposure the metal conducts the cell's warmth to ambient, suppressing core battery temperature and triggering the cold-capacity penalty that lithium-cobalt chemistry suffers below its reference temperature. The same housing physics that hurt the Fenix 8 apply here — but with a smaller cell and a power-hungrier screen, the Epix Pro has less margin to absorb the loss.