I'm just looking for some guidance for running my boat. Do I need to run an external BEC on my proboat impulse 31 v2, I'll be using mostly 5s (2s 50c 5000mah + 3s 50c 5000mah in series)

My driveline modes:

-1500kv dynamite motor
-OFSE upgraded drive shaft
-stock stiletto prop (may switch to grimmracer 42mm in the summer)
-80a dynamite esc (i have 120A esc and 180A esc as back ups)

If its recommended can you please give me a recommended product. I know that I will have to disconnect one wire off the esc but do I connect the external BEC pack directly to the receiver box in the "bind" slot?

Thanks!