[RC-Monster Mike]

yes, I have seen the headways - no comparison to Lipos for energy density, though. The same capacity and voltage in headway cells would be 24lbs heavier, have less than half the discharge capability(though still plenty, though voltage will almost certainly drop more), and would require more space.
The Headways are nice in their own right, but I already had most of the packs needed to make my setup, and even if I only get 100 cycles, this would be a couple year's worth of runtime for a dirt bike(which is one of 2 dirtbikes and one of 4 motorcycles I use regularly). Even if I could run it twice every week for 1/2 the year, 100 cycles would yield 2 years of runtime. I should get way more than 100 cycles, and between RC, my other motorcycles, weather, and making a living, I doubt the bike will see 50 cycles per year - I should get a few years use easily.