I currently fly with my iPhone 6 to use the app features, and a SmallHD monitor for monitoring video. The monitor is powered by its own battery. But I only get two flights before the iPhone 6 battery is done. The app is a battery hog, and it is the weak link in my entire equation. On a job I might fly 20 batteries a day or more, so there's no time to recharge a single iPhone. An iPad would last maybe twice as long, but I'd still have the same problem at some point. The only thing I can think of to do is to buy a cheap Android phone that has removable batteries, and buy a bunch of batts. I know nothing about Android, so wondering if anybody here knows which one would work well with the app and also allow battery changing?