Good day @hamzahack11,
What hardware are you talking about when you say APM?
There's missing information, for example, are you using a PDB (power distribution board, this is where the ESCs will be getting their power from)? Our ESCs also have BEC capabilities but we connect them all to a PDB powered by the battery and connect everything to the Erle Brain (every connector).
Also you will probably have some problems with your battery not having enough juice, I'd recommend a 3S or a 4S.
Could you please give more info? As much as you'd deem necessary.