Hey guys I'm looking to buy a 2012 Phoenix 921 pro XP. This boat does not have power poles but still doesn't appear to have the room for a 5th battery for electronics. I have an 80ah lithium I would like to put in. Wondering where everyone is putting a 5th battery or if it's even worth it. I will be running 2 carbon 12s with active target and a helix 12 with 360.