Rick, the way battery technology is going there'll be something better than Lithium soon enough. We will never see lithium come down to much on price, and that's account of a lot of factors. Do some research and you'll see a lot is going on with batteries account of the electric cars. A lot of research is taking place to find a better battery than lithium account of it not being very recyclable.
I'm here in Miami and have found a fire fly dealer. Am looking to upgrade my trojans(close to 6yrs old) to them. I had to shore up my front compartment where I use 8 6 volts for my solar setup that was installed by MobileHomestead Solar Service. All that weight finally got to the 3 little screws that held the pan to the front support.