I have 3 x-star premium batteries bought on 4/18/20 which are still under warranty for 2 more days, 1 won't charge, 1 won't charge more than 50%, 1 won't charge past 60%. I keep these batteries maintained at 40% storage state and is checked every friday, if they are low I will top them back up, they all seem to have failed this week. I will call Autel tomorrow to see if they will cover them under warranty with a credit or something. This should be interesting to see how they respond!!