Sometimes I take lots of photos and short videos and surf the net on the same day without access to a power source. My Galaxy Note PRO 12.2 with a 9500mAh internal battery can handle it. Which is the best portable, relatively small and lightweight external battery for the iPhone 6S Plus? I guess there are two types. One that provides very fast recharging of the internal battery and one provides external power source and charge the internal battery at the same time.