We have been using Tattu 16000mAh 4s batteries for two seasons now in the Antarctic. Flying the Alta 6 from a small inflatable boat in the extreme cold and 200mile offshore. These have been super dependable with a relatively linear discharge rate and flight times are amazing and have been very consistent!! Tattu are by far the best batteries we have used so far.
Thanks for sharing this. I’m interested in hearing about what you’re doing in the Antarctic - such a remote area! What is bringing you there?