Originally Posted by
MCSEDanny
A friend of mind "stole"

my LiPo battery and plugged into his 4PX this weekend and when he told me (after using it for a qual) I told him they are not suppose to use LiPos and only LiFe batteries. He said it's working fine and continued using it the rest of the race day. What are the disadvantages of using LiPo?
The higher voltage of LiPo on the 4pk caused failures. I definitely don't want to try it on my brand new 4px unless Futaba says its rated for it