Credit: Allputer/The Gadgeteer
You probably know about USB On The Go (USB OTG). It's a standard that allows a USB mobile device to act as a USB host. Practical result: you can connect a USB flash drive, digital camera, USB keyboard etc. to your phone.
But there's another twist: the cable at the top of the article can connected two OTG devices for file & battery sharing.
http://the-gadgeteer.com/2014/08/07/connect-2-android-devices-together-for-file-sharing-and-battery-sharing/ / USB OTG On The Go Android users OTG accessories devices On The Go USB On-The-Go USB OTG specification devices digital audio players cell mobile phones host USB flash drive digital camera mouse keyboard USB OTG roles host client device cell mobile phone read removable media host device USB Mass Storage Device connect connected host computer connect mice keyboards flash drives Android smartphone tablet micro USB connector device cable Allputer cables connect two Android devices together file sharing even battery sharing /
