Hey guys, I'm filming snowboarding for a while now. We always have some issues with our Batteries caused by the low temperatures. I'm using a M10 and the 2,6Ah 14.8V 4S Batteries won't last long at all. Today it was really cold between -20 to -25 Celsius degrees. They were empty after max. 15 minutes... You guys think it would help to wrap them somehow to keep them warm. Also I'm little bit scared how to charge them probably. If I plug them to the charger they're full after 10 min. Thanks for the response..