The original otg cable that came in the box with spark when I bought it. I just finished looking at the dji go 4 app again 4.1.18. Top of app screen says 29% battery power left in red and 4min 37 seconds of flight time left on bar at top of app
Just came back from flying my spark tried both my cell phones (android) have no problem with 4.1.18 on either android 7 on both battery status there. On both etc
