Why does my iPad Mini drain so fast idle? And overnight?

Cl C

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Sep 14, 2016
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Recently, my iPad mini would drain so fast and abruptly. For example, the battery would be around 80% at night, but when I would wake up, I found it around 40%. My software's up to date, disabled push mail, stopped many notifs and I haven't done anything majorly different I could think of than how I used it before that might affect battery life now.

On top of that, a few days ago, my iPad would continuously shut down around 40% and when I tried to turn it back on, it would say it needs to be charged. After I plug it in, it works and it's still around 40%. But when I remove the charger, soon after it dies again.