Bering thermals recommend a 5V 2a external battery source. Many battery packs are 5V but not all. If you contact Bering (which you are welcome to do) and ask them what battery pack they recommend, they will tell you the TRB from TNVC/Night Goggles. It doesn't mean others will not work but it is what they test and what they use when they go to trade shows. Inside of the TRB is an Anker 6700 Astro E1 battery. Anker batteries are cold-weather tested. Many off-brand packs work well in warm weather but can have issues in the cold.
As for how long the TRB can run a Super Yoter, if you aren't recording, have WiFi on etc around 10 hours.