Light starter battery searched

For my Ford Transit V363 I’m looking for a light starter battery. It’s a RV upgrade, which unfortunately has become quite difficult… The starter battery should be renewed anyway, so it’s now on the collar. Basically, the starter battery is always recharged automatically by my Lifepo4 builder batteries if it doesn’t hold the voltage. So now was my thought, I could have a lead acid battery with less capacity and still the same Stro The current installed battery is the following: VARTA Blue Dynamic F17 car battery 12V 80Ah Lifepo4 as starter battery is I don’t think a good idea, because of temperature sensitivity? The Lifepo4 build-up batteries in the air-conditioned interior are theoretically up to 300A loadable, but I don’t want to charge so high or do I not want to use the entire built-in Microco. destroy ntroller with the on-board network. Then I would need at least 2x120qmm cable, and that at about 6m cable path, then the cables weigh the saved battery weight