I noticed there are various threads about fast battery drain on BB10.
I had same experience. During night, none use, the battery lose about 5% per hour.
Trying many things, nothing helped.
Until I did the following.
- make backup from phone
- reinstall BB10
- reinstall all the apps
- !!! Open all the apps and initialize them.
After this last step battery drain is less then 10% during night lose less then 1% per hour.