I used a 4 cell Li-Ion pack I ordered from http://www.superbatterypacks.com/ Bern made me one up with 16ga leads and Deans connectors. I then used Smart-Fly SuperSwitch http://www.smart-fly.com/Products/Switch/switch.htm through a Smart-fly HD regulator http://www.smart-fly.com/Products/Regulator/pic2.htm that has deans in and twin outlets.
Have never had a problem ever...

You could if you wanted to spend the money for insurance run 2-2cell Li-Ion packs through a dual regulator or to a Power Expander, it will work no problems at all, but you do add probably $300 or so to your electronics bill. But if it makes you sleep better then I say go for it!