That's the thing I need to read up on. 6s could handle my charge voltage (>= 15V for a long time after cranking) but I am always worried I'll be too close to the minimum charge for the cells. Clearly you aren't having problems.
I still don't know exactly whats going on. I know bursts like starting cars and such require alot of current, but not much overall power. With my 14.4v I'm probably only getting 60ah of capacity from my bank or so? Someone did the math on here. I don't believe there is really a minimum charge. LTO is a bit weird. It will run down to 1.5vish per cell or 9v for a 6s, and that's pretty much empty. But from what I've read they are happy anywhere from 1.7v-2.7v. Still reading about all the little details.
Matt