lithium iron phosphate batteries aren't really that exciting - some early adopters are marketing them at folks with big wallets, but they're not flying off the shelves.
the industry is not building cars, trucks or trains with them
![](http://www.batteryuniversity.com/_img/content/BU-205_chart-2-web.jpg)
I'm looking forward to mass produced, affordable NMC packs... 48v nominal is fine, trying to fit these high energy batteries into low energy pigeon holes is counter productive, jmho