I'm guessing it's 7.4v min, since the ESC is intended for 2-4S and all the info i could get about it didn't mention anything about external BEC's required.
Little off-topic, LRP SPX8 combo is light! I saved 123 grams from the MMM-2200Kv to the RX8-1900Kv, but this is even lighter! 100g less than the Tekin...I would be under 3000g now if i had the LRP...
PS: Yes, i'm a lightweight freak
