Rather than jumping back to the iPhone and HOPING it'll get you better battery life, why not try a different Android phone? The Droid Turbo has a fantastic battery, and Motorola historically has some of the best radios in their phones so you may get better signal pull and lower battery drain as a result. You're on Verizon so the Turbo is an option. I know it wasn't released yesterday but it's still a good phone and has none of the bloat you get with the S6.