I searched the internets for this mod, and could not find and reference or pictures for it. so I did it. may I humbly present to you, the dji phantom 2 vision r/c controller 4 aa battery to usb mod. I did not like the fact that the dji phantom 2 vision rc controller used 4AA disposable batteries. this is 2015. that seemed like a poop idea to keep buying batteries forever, and not even knowing their strength over time out in the field, as the controller only has a dummy light, and no meter or other indicator, etc. so I sought to replace them with a lipo battery. I was going to Velcro a battery pack to the underside of the controller and wire it to the IN power on the board. but I really could not find a 6v pack that I liked, and I was going to need a special charger, etc. I also needed to step down from DC 7.4v battery pack power to DC 6v controller power. so that idea sucked. while searching stepdowns, I saw some buck / boost converters and got thinking about it - if I can boost 5v from USB into 6v, I can run the rc controller from any USB source - my laptop, a usb thing charger (I made these in 2006! this one I made used 2xAA into USB to charge your phone..) ... so anyways I bought a tenergy battery pack model with 4 usb outs, 2x 2A and 2x1A outputs. and I bought a buck / boost converter board that was within dimension of 4AA batteries, with the idea to fit it inside the battery compartment. and I hacked up a USB cable.