Tab3 7 battery fast draining

Hi there,

The tab3 7 Essential is over one year old. Recharged ones a day. So far battery life before recharging was ok. Two week ago it did not want to boot up. I needed to disconnect the battery. Now one week ago it started to drain the battery very fast when I'm reading a book on the device.

I tried to switch into airplane mode or activated "Standby intelligent powe saving". I tried to identify any abnormal usage from other apps, but could not locate them.

Any clues? Do I need a new battery?

Cheers,

T.