On a recent round trip outside Sprint LTE territory and returning to LTE territory, I tried the often recommended trick of turning on Airplane mode for a several seconds and back off to try to get better mobile cell phone towers or the one in front of you.
Everytime that I did, Lookout created a photo and email. For the next few days, my battery usage report showed Lookout at 43% of battery usage. Also the battery dropped 20+ per cent very quickly. I had battery recharge periods of 10+ hours. I finally set all the battery saver settings. The phone got to a full charge in a very reasonable time after that.
I got mad and turned the phone totally off. I gave it a good twenty minutes before turning the phone back on. It appears that Lookout is now down to it's more reasonable battery useage.
As long as I leave the battery saver on, the battery stays charged for a good long time.