battery life

Hello folks, I'm building an automated charger that will charge up to 8 (inspire batteries and/or remotes). It is based on an arduino that controls relays and monitors the voltage, current and power taken by the battery been charged. Note this is a sequential charger and uses the standard 100W...

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...