I guess you would have to calculate amp hours to cranking power if you went lithium. However I suspect the little lithium motorcycle batteries would be best suited as they could survive the constant 14.4 to 13. 8v DC to DC charge. I guess I should check by testing or ask what the charging cycle of the Leaf 12v system is...since it is a lead battery I'm guessing it is identical to an ICE system. I have some Genesis batteries that are 13 ah. two might fit in there. Maybe 3 for about 40ah or the same as the Valence medical battery which you can get for 100 dollars if you look around. I used two in my eGo. However they only put out about 40 amps continuous. Seemingly that should be plenty. However if I knew the parasitic drain in ah you could calculate the need for months of disuse. That said most people that park a car are smart enough to use a 12v tender to save the battery. Really I was just a little annoyed I had to spend $185 plus tax for a replacement at the auto parts store. You can get those 12v solar tenders to put in your dash. Lawrence Rhodes https://www.summitracing.com/parts/sbt-lfx09l2-bs12?seid=srese1&gclid=EAIaIQobChMIsojYtNXR7QIVDSCtBh2JCgZPEAQYASABEgJ-TPD_BwE https://www.chapmoto.com/bikemaster-lithium-ion-battery-parent-378-0800?sku=378-0803&gclid=EAIaIQobChMIsojYtNXR7QIVDSCtBh2JCgZPEAQYDyABEgIYOvD_BwE
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