I also had a couple of 17Ah Portalac batteries come in that I ordered from MECI.com for $20 each. These things are very light for their Ah rating.
I weighed them on three different scales and got about 13 1/2 lbs each. That's a very impressive lb. to Ah ratio! I don't know if I'm actually going to use these or not, but @ $20 a pop they were deffinately worth a look ;)
I'll keep you posted on just how they "test out".