"Hi Yassine,
You have found the wrong connector. It should be the SMT one as stated here for pixhawk:
ARM MINI JTAG (J6, not populated per default): 1.27 mm 10pos header (SHROUDED, for Black Magic Probe: FCI 20021521-00010D4LF (Distrelec, Digi-Key)…"

"They do pretty bad. The one I use (Turnigy 4S 5A 30C) drop 1.5 V even at +5°C.
The general recommendation for LiPo operating temperatures are:
 charge: 0°C - 45°C
 discharge: 0°C - 60°C

Here is a good explanation on the LiPo operating temperatures:…"

"Hi, I have the same question and can't find the direct answer. So I have checked datasheets of some core components and their low operating temperatures are -40°C.
However there are lot of other components that I didn't check and some of them may…"