Two quick questions.

I'm in the process of making a bait boat for fishing. To help with keeping it balanced I'd like to use two batteries. Would this be be possible as long as the voltage didn't over load the esc? I'm sure I've seen a "Y" style deans connector.

My other problem is I bought a cheapy mini Turnigy T5180MG servo which is meant to have 180 degree movement but after connecting it all up it just has the standard movement. Have I got something set up wrong or is it faulty?