Well, honestly, you don't really need an LiFe battery for the electronics(I personally only use them in my transmitter), when using a 2s ESC all you need is something like this:
http://www.hobbywingdirect.com/produ...-dc-dc-booster . But unless you're running in extreme conditions with the hottest motors, you don't really need to go that route, a good 1S speed control(like this one:
http://www.hobbywingdirect.com/produ...0a-1s-v3-1-blk )will do the job just fine, no difference in on-track performance, except in the most extreme circumstances. As an example, at the IFMAR On Road Worlds a few weeks ago, those guys were using the 1S ESC's at first, but they found that something about the track, the conditions & the motors they were using were causing some overheating issues, so most of them switched to a 2S speed control with an external booster. But the rest of the time, they typically use the 1S ESC's. I also use them in mine with a 17.5 motor(I have the HobbyWing V3.1 1S myself), tried it a week & a half ago for the first time(I'd been out of 1/12 scale cars for over 10 years, when we were still using brushed motors & 4-cell NiMh batteries), & I'm really happy with how it's running. I think for most of us mortals, a good 1S ESC will be all we need....
