I’ve been looking around for a lithium battery for a jump pack I’m trying to make since the battery in the car can’t handle the cranking amps alone. My friend has a Bosch 12v 420a lithium battery but he also uses it for much larger engines, and since mine is only a 1600cc Ford Kent engine I don’t think I’ll need that big of a battery. I was thinking one with anything more than 250 cranking amps would potentially work but I don’t want to be wrong obviously cuss that’s still gunna cost me over 200 bucks. I also have read stuff about the LiFePO4 batteries being better than any other batteries for longevity and consistent voltage and current. Lmk if anyone has any info I’d really appreciate it.