Ultracapacitors + LiFePo4 setup is nice and cheap, reliable and reduced that risk of lithium fires.
Otherwise Ultracapacitors (http://www.mouser.co.uk/ProductDetail/Ma...e2ICx7HjQJ) and a smaller lead acid battery.
Or the ultracaps and a huge lead acid battery like I have!
Otherwise Ultracapacitors (http://www.mouser.co.uk/ProductDetail/Ma...e2ICx7HjQJ) and a smaller lead acid battery.
Or the ultracaps and a huge lead acid battery like I have!