I just upgraded to a pair of 12V 100AH lithium batteries for the trolling motors and wanted to go lithium for the cranking battery on the outboard/electronics mainly for the weight savings. After a bit of research I decided to stick with lead acid for now on that application to avoid alternator burn out and other issues lithium can cause. I am sure dependable, trouble free lithium cranking batteries are very near and I will look again when they are perfected and the costs come down.