Lithium starter battery

[Dimitri_Raptis]

I have a Porsche Cayenne that uses a lot of electricity when the engine is off while camping (lights, door locks, etc.) and I have a set up of two 110ah starter lead acid batteries and an additional 100ah lithium leisure battery. My problem is that the lead acid batteries are heavy and take
Up space. Do you have any experience or suggestions with lithium starter batteries? Thanks. Dimitri