The Mercedes EQA, Hyundai IONIQ 5, and BMW i4 hold onto their battery health better than any other electric car, according to the largest independent study of used-EV batteries ever run.

That’s the ranking that falls out of 500,000-plus battery tests published by Austrian diagnostics firm AVILOO, which measured 20 popular EVs at up to 150,000 km (93,000 miles) of use.