An understatement. $830 for a Li battery. Youtubes show starting a V-8 with a hand-held array of super-capacitors or a small Li jump packs, but that is in ideal conditions. I've used a small battery in my 65 Chrysler w/ big-block for a time in Atlanta. As long as not really cold and you don't have to crank long, you may not need the spec battery. The latest Tesla cars finally dropped the 12 VDC lead-acid battery for a 12 VDC Li battery, but they don't need much and used a half-size lead-acid anyway, as do most hybrids (no starter motor). I'm waiting for a small battery which will work in our cars, and be affordable. That will let me fit the AC compressor and brackets I have from a Volare slant to my 1964 slant without threatening to poke a hole in the side of the battery.
