GoKawiilGeotab study finds EV batteries lose 2.3% of health per year on average
Fleet company Geotab tracked over 22,700 EVs and found average annual battery degradation of 2.3 percent, rising to 3 percent for cars that frequently fast-charge above 100 kW versus 1.5 percent for those that rarely do. Hot climates added about 0.4 percentage points of extra yearly loss, while separate research from Recurrent on 30,000 US EVs found range drops to roughly 78 percent in freezing temperatures and 70 percent at -7°C.