New to the forum and the hobby as well!
 

Hello everybody, i'm new to the forum and just bought an Aquacraft Wildcat boat.
Need help with the batteries for it, which ones do you recommend that last long and powerfull?

Welcome to the "addiction". I think you will find, over time, that "addiction" is an accurate description.
About your boat:
1) It's a plastic hulled beginners boat, no more or less
2) It has a top speed of 25-30mph, not bad but not real fast either
3) This is what I found on owners revue about run times and battery sizes:
"As for batteries, this boat uses one 3S 11.1V 30C battery. I have 2200mAh, 3600mAh and 4200mAh Lipo packs, anything larger than 137mm may not fit on the boats battery stand. On the 2200mAh, I get about 5min 30secs run-time if I shut-down after 80% capacity of the battery. I never run past 80% Lipo capacity. The 3600mAh I get about 8min and 10mins on the 4200mAh, also using only 80% capacity of packs."

Thanks for the reply.
Mi first option was a Chaparral Villain but found it slow IMO.
Then choosed from Traxxas Blast and this one and liked more the Wildcat.
Its my first boat so i didnt want to go deep ($$$) without knowing how much i would like the hobby.

Also, is there any advantage with a metal propeller?
Do this motor requires lubrication?

In answer to your questions:
1) yes, a metal prop is better. Plastic props tend to have their blades flatten out under load where a metal prop won't
2) Not sure about the motor but the prop shaft needs to be greased after a day at the pond to prevent rusting and water from entering the boat through the stuffing tube