Careful not to charge the lifepo4 in the cold. I read that you can charge them in the freezing cold and think you got a full charge when you really didn't.

The only thing BMS's are for are the consumers who just want to plug it in and not worry about it. Enthusiasts like us can navigate around those things. The only thing that is really absolutely necessary with Lithium is a Low Voltage alarm and that's only if you want to use the entire pack (which most people do). If you know what you are doing, a standard BMS really isn't necessary. The electricity does flow through all the cells. The people making the BMS try to pretend that the electricity doesn't flow through all the cells. Well, that's nonsense. As long as you don't have a charger that takes past the high voltage threshold, it's fine. You just have to find a way to top them off every now and then.