Updated September 2026
Winter
Heated jacket runtime calculator
Cold steals battery capacity. Enter your pack and heat setting — see honest runtime at −20°C before you are counting on it.
Illustration, not a product photo.
Your pack, your heat setting, the cold
Battery numbers are printed on the pack. Cold-capacity derating is a planning estimate, not a lab measurement.
Deep-cold rule: keep a spare pack warm — inside pocket, not on the dash. A frozen spare starts the night at a disadvantage.
Won’t last half a shift. Carry a charged spare pack or plan a recharge stop.
- Cold-capacity numbers are planning estimates, not lab measurements — real packs vary with age and chemistry.
- Most jackets cycle on a thermostat, so real-world runtime often beats this continuous-draw math.
- A heated jacket warms you, not the cab — personal heat for pre-trips and fuel stops, not an idle replacement.
- Keep a spare pack warm in an inside pocket. A frozen spare starts the night at a disadvantage.
pack Wh × cold % ÷ jacket W = hours
Worst-case continuous draw. Thermostat cycling usually stretches real runtime past this number.
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Research-based. We did not test these hands-on. Scores come from published specs and driver reviews. Cold-capacity derating is a labelled planning estimate, not a lab measurement. Change any input and the math re-runs.