For better battery life on Z10: use 10.1 and these settings
- disable LTE (best battery life on fixed 2G - enough for email and text, and you could only enable on demand)
- disable NFC
- Wifi can be always on
- disable gestures on locked screen
- set Crackberry App to update only manually (it sucks a lot battery with 15 min update interval)
- set other Apps to manual update if you have those
- Facebook, Twitter, Evernote can be used just normal
- screen timeout 30 sec
- disable diagnose data
- location settings: on. location based ads: off
- BB Protect: on
And: the device needs some chargy cycles to learn.