Except prices are falling. You haven't accepted that. Others have. "They" will try to inflate, but your own post admits they will fail for (perhaps) 5 years. Telling people to buy stuff now is simply bad advice.
The manufacturer says 75%:
http://www.ngk.co.jp/english/products/power/nas/index.html
Also they say 2500 cycles and 15 year life. Which is fairly unexciting in the battery world.
I thought driving away from an accident was illegal.
Seriously, trucks are way safer, if driven slower than I want to drive. That's why I drive a AWD car so I can pass you safely.
I would suggest buying a skidsteer.
It's a naive, domestic operating system without any breeding, but I think you'll be amused by its presumption.