Need help regarding Losi Xcelorin 1/10 Sensored

[Rusteh101]

Hey people,

I converted a nitro rustler over to brushless using a Losi Xcelorin 6.5t Sensored system, however under acceleration its getting this weird surging.

The light on the ESC flashes red which indicates reaching the low voltage cut off point but I know that the batteries are fine as I run them in my E-Revo with an MMM system.

It also seems to want to continue running when no input is given from the tansmitter when it is under heavy load.

Where do you think the problem lies?

Please see the two below videos for clarification.

Thanks,
Jonny

http://www.youtube.com/watch?v=zpzXZ27wIII

http://www.youtube.com/watch?v=Rjn8XSlHkMs