Battery Reality Gap · Dossier

Coros Vertix 2S

Forensic battery audit · Formula v1.0 · li-ion-cobalt / MIP / titanium

→ Compare against the Garmin Fenix 8 (76% gap)

Coros markets the Vertix 2S at 43 hoursof multi-band GPS endurance — the most conservative claim of the titanium-cased pack. Under the HikingSpecs reference scenario, Formula v1.0 calculates a blackout at 21.8 hours: a Reality Gap of 49.2%. A more honest starting number does not change the verdict. It still loses roughly half its advertised endurance, and it still classifies as a critical failure risk on any route planned around the marketed figure.

The titanium tax, again

The Vertix 2S shares the Fenix 8’s core liability: a titanium case. Under wind exposure the metal conducts the cell’s heat to ambient, suppressing core temperature and triggering the Arrhenius penalty that lithium-cobalt chemistry suffers in the cold. Its 2618 mWh cell is modestly larger than the Fenix’s 2400 mWh, which buys it a slightly smaller gap — but the housing physics are the same, and the result is the same classification.

Where it lands

On reality gap the Vertix 2S sits between the Fenix 8 (76.4%) and the Enduro 3 (53.5%), closest to the Enduro. At €699 it is the cheapest of the three, and its lower marketing claim means less distance to fall. But cheaper and more honest is not the same as reliable: a 49% gap still means you cannot plan a long alpine objective around the number on the box.

→ The least-critical performer: Garmin Enduro 3 dossier

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