RE: Sumo micro crawler question
Yes you can run it on a 2S LiPo. Good thing RedCat put a power connector between the battery box and the ESC, so no need for soldering.
I wouldn't recommend anything higher than 250mAh and running it for 30 mins tops or have a low voltage alarm.
Personally I have 200mAh 2S 20C LiPo and run it for 20 minutes continuously maximum.