Originally Posted by
Boulderian
While in airplane mode - wifi and bluetooth off - and with 50% screen brightness on, the iPad lasts about 4 hours of constant use (screen always on while using JeppFD following along route.). I shut it off and let it charge during break bringing it back to 100% by the time I return to cockpit.
If you allow the screen save mode (screen auto shut-off if not touched), with light to moderate use you will get abut 10 hours (10% per hour as someone mentioned above.)
Go to settings>privacy>location services>Jepp FD PRO and either turn it off or only when in use. It uses a ton of juice looking for or updating position info, even when the iPad is off. Also try closing all your apps when at cruise and you don't need it anymore.
Also go to settings>general>accessibility>reduce motion "on"
The line user guide also has a bunch of other worthless settings you can turn off to minimize battery consumption.