As electric vehicles enter the used market, pressure is growing on manufacturers and sellers to provide detailed information on their battery health so that purchasers know what they're buying.
Factors affecting it include unit age, high temperatures, operating at high and low states of charge, and high electric current and usage (energy cycles). Variations in battery chemistry, thermal management and buffer limits (the cap a manufacturer places on the top and bottom ends of a battery's charging range) also affect battery health.
