Battery Reality Gap · Comparison
Garmin Enduro 3 vs Coros Vertix 2S
Forensic battery comparison · Formula v1.0
Garmin markets the Enduro 3 at 60 hours and Coros the Vertix 2S at 43, a claimed 17-hour lead for the Enduro. Under the HikingSpecs reference scenario that lead shrinks to five. Formula v1.0 calculates the Enduro 3 blacking out at 27.9 hours and the Vertix 2S at 22.96. The Enduro is still the longer-lasting watch, but the margin the marketing promises is more than three times the margin physics delivers. Two endurance specialists, and the gap between them is smaller than either box admits.
Why the Enduro keeps the lead
The Enduro 3 carries the largest cell in this matchup at 3200 mWh, against the Vertix 2S's 2618. That is its decisive advantage: a larger reservoir empties more slowly under the same continuous GPS draw and raises the thermal floor before cold-induced capacity loss sets in. Both watches use a non-conductive polymer body that protects the cell from wind-chill far better than a titanium case would, so neither suffers the thermal penalty that drags down a Fenix. The Enduro's lead is energy, not insulation.
Why the claim oversells it
The 60-versus-43 marketing gap is built on each manufacturer's own best-case bench conditions, which are not comparable to each other and not comparable to a cold alpine night. Under one fixed scenario applied identically to both, the Enduro posts a 53.5 percent Reality Gap and the Vertix 2S a 46.6 percent gap. The Vertix actually loses less of its claim in percentage terms; the Enduro wins on absolute hours only because it started with more energy. Both carry a CRITICAL classification, and both demand a power plan on a long objective.
The verdict
If the single priority is the most calculated hours before blackout, the Enduro 3 is the pick at 27.9 hours, and its larger cell is the reason. But it costs €999 against the Vertix 2S's €699, and the real-world lead is five hours, not seventeen. Whether that gap is worth three hundred euros is the buyer's call. Read the Enduro 3 dossier or the Vertix 2S dossier for the full breakdown.
Physics-derived estimate under one fixed reference scenario. The model is calibrated but not yet independently validated against measured field runtime. Estimated hardware inputs are labeled as such. Full method at /methodology.