MG ESC Question

[hobie]

Hey, I'm just putting the 5s setup in the geico, removed BEC, and using separate battery for reciever. My question is, when I'm arming it now, I get double beeps, I think about 4 sets of them, then everything seems fine. When the BEC is hooked up it only beeps once to arm??? It is doing that to say I have a separate battery powering things? Or did I mess things up?

Thanks in advance