Hi!I have a galaxy s2 with android 4.1.2. I also have the otg cable you suggest. I connect it to APM 2.5 with no battery supply and nothing happens. What is the proper way to connect it? I have different power supplies for apm and inputs and for outputs.( apm jumper removed ) should I connect batteries as normal and then connect my phone to OTG adapter and this to APM usb ?? I don't want to fry anything....Thanks!