I am not sure if this issue was reported before, but I could not find it.
I wanted to use Pixhawk on the Turnigy Integrated PCB Micro-Quad. I followed the following video for the parts and the assembly
However, I replaced the controller with a Pixhawk. I used the 3DR power module to power the Pixhawk, but cut the thick cables and replaced them with less thick ones that match the wires of the remaining components as I thought the thick wires are too big for 2S LiPo battery.
I am using 850mAh, 2S batttery.
The ISSUE is when the battery is fully charge I could fly the quad for a minute and then the battery dies, the charge drops from 7 to 5.5V. Tow batteries are gone now for the same experiments. I am not sure what the problem ism but am suspecting that the 3DR power module is not suitable for 2S LiPo battery and it's causing the problem.
The problem was that I didn't fully charge the batteries before the first use. I fully recharged them, and then they worked just fine.