Ok, so I filmed in a remote cold location (10-15F ) all day, 6 Hours film time. I was charging 2 at a time like I always do using my generator, power supply, hyperion duo (they were all out in the cold) . Towards the end of the day I start getting 15 seconds of flight on most of the batteries. I get home, discharge all the batteries and charge them all at 1amp. I take one out and test it on the heli, get 5.5 minutes of flight with camera. Don't test any others. I then go on a remote shoot on a snow-covered mountain side. I have handwarmers and all my lipos in an insulated lunchbox. At least 5 of my 7 lipos give me a telemetry warning after 10-15 seconds of flight. Are my lipos bad? Is my charger bad? is my power supply bad? Has anyone had similar issues? Appreciate any help!