Before deleting apps you use Karen, see how many are open and running in the background. Double press the bottom (Home) button quickly (while on one of the app screens) and that will bring up all the apps you have open at the moment. Swipe them upwards to close the ones you aren't using. There could be dozens running and using battery power - maybe some you haven't actually used for months.
When done, click the home button once again to return to normal. See if your battery life improves with that first.