I have switched all my big planes to A123s. A single A123 can handle anything up to 100cc can through at it. The nice thing is they recharge in 15 minutes and they don't loose anything over time. A cellpro 4s charger is all you need. The other thing that was mentioned is switch redundancy for your receiver. You could use 2 HD switches, a smartfly or a Fromeco wolverine, all will accomplish what you need. One thing with this size plane vs a small glow plane is safety. I recommend going over everything and I mean everything 2 times before you fly then have someone else who flys check it again. (making sure all servo connections are either taped, shink wrapped or something and use lock tight (blue) on metal to metal connections. Pin the fire wall etc. I usually fly the first flight and come in and check everything again and after the first fully day I bring it home and tear it down and check everything one more time. You can get wire chaffing or a loose connection that will ruin your day and possibly someone else's really quickly with this size plane and up (not that you can't with a glow plane) but the vibration is much greater with this size gas. One last tip balance your prop and spinner and it will reduce some of that vibration.
Jeff