"I would be careful discharging your batteries to the point where it won't take off - this will almost certainly damage them.
I just configured your setup in ecalc and it's coming back with a hover flight time of 8.9 minutes.with an AUW of 12 lbs.…"

"I think it fairly unlikely to be a problem with the batteries or the charger, more likely something to do with the set up of your X8.
Have you measured the battery voltage with a lipo tester / multimeter? (should be 16.8V when full for a 4s battery)…"

"Ecalc probably isn't far off saying it won't get off the ground, those props are WAY too small. Those motors are designed to be used with 11-13" props on 4s. (and would need at least 30A escs.)…"

"It's a bit difficult to know what the problem is from your description  (and I'm not familiar with DJI flight controllers).

By payload do you mean AUW (all-up weight)?
Let us know more details of your build (motors, props etc ) and we should be…"

"Easily overlooked, but possibly one of the most critical components in your rig!
I'd suggest next time you test, set the failsafe to Land rather than RTL. 
Once you're happy with how it's flying and have tested GPS modes (e.g. loiter) are working…"

"I'm actually in the UK and ordered from AltiGator but the 2 LiPo kit from Craft and Theory looks like everything you'll need."

"I had a few kind people help me out when I first got started so feel obliged to give something back!
I'm using the the 12000mAh version of the Multistar - the 10,000mAh is totally fine though, although I'd suggest running two inparallell as you…"

"Yes, the battery failsafe triggered and then it switched to RTL and so actually tried to gain altitude to fly to the home location. 
It looks like your motors are wired up OK now though which is a good start.
Your battery voltage does sag a LOT as…"

"I plotted RCIN.C3 (throttle) vs RCOU.C1 through  RCOU.C8 (motors)
(have a look at attached image, red line is throttle, others are motor outputs)

Good luck with your test.

Justin

graph.JPG"

"....and while I think of it, ignore the CW / CCW markings on the frame. They are for a DJI flight controller, Pixhawk is different, make sure the motors rotate the way marked in the diagram from my previous message. "

"Maybe you've already figured this out, but looking at your logs, you only applied a small amount of throttle, and motor 3 went almost to full power.
This would probably be because the flight controller is trying to level the copter by increasing…"