Have the same problem...
In the morning around 7 when I unplug my charger batt is on 100%
10 min of browsing on wifi it goes to 85%.
It holds on 85% from 8-11 AM
Then I turn mobile data on, browse for about 20 sek and it crashes.
Keeps on restarting and batt is on 0%
I connect the charger batt...