Cogging/9920 Problem

[Serum]

You use a external batteriepack;

the only three things that can happen are these;

1 losing connection between your esc and 'powersupply' (ext pack) or the pack is not powerfull enough.

2 receiver is acting up, or the transmitter is loosing signal with it and the receiver goes into 'failsafe mode'

3 last and the worst; the 9920 might have got a dead short in it, which takes all the power from the external pack.

You don't have got your BEC jumper on the 9920?