Winter has arrived, and stating the obvious winter bring temperatures below zero. Something our drone batteries really don't like.
If you have flown in temperatures below zero, you have probably like me already tried getting the propulsion output limited warning on your DJI Go app, and I bet you the first time it happend your heart jumped and you took your drone down straight away and rushed home and started googeling until you discovered that it wasn't a issue but merely a security measurement DJI has implemented.
I have found that the Heat Pads used to warm sore muscles and joints work excellent as small heaters, the one I buy in my local supermarket are activated by air so as soon as I break the plastic the slowly begin heating to about 30 degrees Celsius and can keep your drone and batteries warm all day.
It takes them about half an hour to reach maximum heat so I usually opens two and place with my batteries before I leave home. It is a small and cheap way to keep your drone warm and safe in your backpack while hiking to location. And also it has a ekstra bonus IMU warmup goes really fast because your drone is all ready warm when you get on location.
Hope this helps someone out there :-)