iPhone, iPad tricks to make your battery last longer. Saving battery
Having a jailbroken device will enhance the possibilities to make your battery last longer but even with an original device these are the things that are making your phone last longer:
Turn off frequent locations: settings → privacy → location services → system services [ this thing is ridiculously sucking off your battery, the only thing that does is constantly checking where you are and waiting until some of your siri or calendar/reminders options are "TRUE" example: asking siri to remind you to call john when you get home, if you set your home address when you get home your iPhone will remind you to call john. It's cool but not worth it the battery consumption of the GPS.
On the pictures above you can see my GPS configuration and I recommend you to do the same, the reasons are well studied and the battery will gain life. THE ONLY THING YOU NEED TO TURN ON IS "SETTING TIME ZONE" EVERY TIME YOU ARE GOING IN A DIFFERENT TIME ZONE PLACE THAN YOURS AND AS SOON YOU GET A NEW TIME TURN IT OFF.
Put all push notification and email notification as manual, Push suck battery as well.You just have to press on the email app every time you wanna check the email.
Put auto brightness OFF
Shut down WiFi and Bluetooth every time you don't need it
Keep luminosity lowest as possibile [ not super important]
Quit multitasking app, DOUBLE HOME BUTTON CLICK → SLIDE UP !
Turn off "hey siri" settings → general → siri → Allow "hey siri"
Completely discharge your battery at least once in a month and charge it completely without unplug the power chord.
Use ORIGINAL plug ad charger.
AND MANY OTHER MINOR
Turn always the computer off when you don't use it
Try to use it as more as you can powered wit the cable
Discharge completely and recharge once a month
Use some additional supports with a fan to cool down the system