Swapped to a lithium battery, my 66 Mustang cranks 3x faster now

Was at a car show in Portland last month and a guy with a old Falcon told me to ditch the lead acid. I was skeptical but grabbed a 12V lithium from the parts swap for $180. Cranked the 289 over after sitting 6 weeks, it spun like it was brand new. Anyone else make the switch and notice a difference in cold starts?

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