A few days ago my ipad abruptly shut down overnight. I believe it had around 50% battery left . Now its just screen off it...

Well so this an update: no the iPad never booted up again and since apple was charging me 400usd for a replacement (Apple India i mean) i bought The newer 32gb IPad 2017 or 5th generation :( Sadly the Air 2 is just paperweight now

Well I went to the service centre today. They said there is no option but to replace the entire unit. (They do not even know how to open an ipad). Now I will try going to an independent repair shop. PS : As I am a student I do not have enough time to open this thing to check whether the battery is working