Those Li3 batteries sound intriguing...The reduction in weight seems significant!
Price of this newly packaged Li3 product (not yet mentioned) seems to be the crux of the matter for wide-spread RV use, etc...I assume it will be 'pricey', if the Li small batteries now available (for cameras, etc.) are any indication...
Once a 'normal' service life can be determined, one could seemingly compute a rough cost/year of life to compare with AGM's and flooded cell types...
There will always be those that want the 'best' no matter what the cost - don't know how big that market might be for this product, however...
I applaud them for developing this technology for more wide-spread use in vehicles, etc...Maybe there are others waiting in the 'weeds' to join in, bringing costs down for us!
Who knows, with the price of Lead increasing as it has recently (along with Gold and Silver!) - this Li technology may be upon us sooner than later...
With $5/gal gas upon us, a $500 Group 24 deep cycle battery can't be far behind!