I always have mine (iPhone 5) for maps, GPS, pictures, Texas Holdum, etc. On longer trips I leave it off unless using it and am good for about 4 days. On short trips it is on airplane mode. I also bought the $32 Brunton Ember at Walmart and have been happy with it and I was able to keep my phone charged over 4 days with almost normal use. It has an internal battery good for about 3 charges and a solar charger that charges the internal charger battery. It all seemed to work well and was reasonably priced.
If I were to upgrade I would look at the Goal Zero units.