So i have had my ipad for a while now, almost 4 years, its an ipad air. And it got dropped and the screen has cracked. i havent managed to get it repaired but then the battery started to go funny on charges, as it dropped 10% instantly and turns off randomly. Now i have used my ipad since last november but its been sitting around and i have kept in charge before but now all it will do is show the low power bar constantly and i cant reset it or anything. is there anything i can do or do i need a new one?