Read what I wrote again, I said 300Wh/kg is 50Wh/kg above what's used in expensive UAVs. There are setups out there using high amperage Panasonic cells at 250Wh/kg for 12S systems. You build a pack with 12S strings of high amperage rated Panasonic 18650 or 20700 and then parallel multiple of those strings together for large capacity (such as for something the size of a freefly alta X).

A small quadcopter that uses a gensace/Tattu 1200 mAh lipo pack is not an expensive uav. I think everyone who uses hobby size lipo knows their specs around 135-160Wh/kg.

Any BMS that you can recommend for this panasonic setup?