Firefly's Oasis Group 31 batteries getting some EV fans excited {Autoblog Green}

Jan 26th 2008 10:37AM What am I missing here ? They claim great weight savings. Their pdf at:
http://www.fireflyenergy.com/images/stories/pdfs/G31%20Specification%20Sheet%20012308.pdf
shows that battery will weigh 70 lbs.

What is the weight of a similar sized truck battery with common lead plates ?