Ah are ah but apples are not oranges. A 100 ah lithium is equivalent to a 200 ah lead battery. Why? Because the power band of the lithium is much wider. You can extract 80-99% of the power from a lithium versus 50% roughly from a lead.
A cheap lead will last 3-5 pricier 5-7 yrs. A lithium will last 10+
Lithium has benefits in banks. Is it worth it to replace 1 or 2 lead? No. Is it worth it to replace 6 or 8 lead? Absolutely.
Don't skimp on chemistry or a BMS. Managing a lithium pack doesn't need to be scary, IT IS rocket science but luckily there are computerized modules that are already programmed to care for your packs.
