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Like John said, the 'deer feeder' style of batteries work beautifully and hold a charge a long time. I use a 12v/5am battery for my Lowrance Elite-4x DSI and it will run for three trips. I keep mine in a small Sterilite sealable container stowed underneath the center hatch. You can use any number of sealable containers like Pelican boxes, Glad or tupperware containers, etc. The beauty of this type of modification is that you probably already have a suitable container in your house that is not being used.
As far as the vessel itself, the Pro Anglers are single person designs; however, my son rides shotgun in the rear tankwell whenever we go out on the water. We can both stand and fish side-by-side with no issue. The cost of a Pro Angler 12 or 14 is more than worth it in my opinion when you take into consideration that you do not need to register the vessel as a powered watercraft, nor do you have any annual fees associated with taxes, maintenance or insurance.
As far as powered options, Hobie has a licensing deal in place with Torqueedo, and they have the Evolve electric motor that inserts right into the Mirage Drive opening on the Pro Anglers. Other companies like BassYaks and Gator have alternative options as well, but the Evolve option is the cleanest of them all and the lightest. It is somewhat cost prohibitive for me, plus it would mean that I would have to register it as a powered vessel.
I prefer to use my legs and the Mirage Drive to move my Pro Angler, but if your situation necessitates a powered solution, it is an available option to consider.