What five winters did to my EV battery - and what actually helped
Owner measurements from Minnesota, including charging habits, temperature, mileage, and the mistakes I would avoid.
I tracked range, charging speed, and displayed capacity across five Minnesota winters. The largest temporary range loss came from cabin heating and cold-soaked cells, not permanent degradation.
Preconditioning while plugged in made the clearest difference. Keeping daily charge below 80% mattered less in winter than avoiding long periods parked near empty. This is one vehicle and climate, so treat the numbers as a firsthand report rather than a universal rule.
Where do you stand?
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4 responses · oldest first
Did you track whether the car was parked indoors or outside? That changed our winter results more than expected.
Outside for four winters, then an unheated detached garage for the fifth. The garage reduced snow and wind exposure but did not keep the battery meaningfully warmer overnight.
That distinction is useful. An unheated garage is often treated as indoor parking in published surveys, which can hide most of the temperature difference.
The temporary-versus-permanent loss distinction is the strongest part of this report. Adding the displayed capacity readings by year would make it easier to compare with fleet data.