Lithium-Ion Phosphate Motorhome batteries (A.K.A. Li-Ion) have been around for some time now, the price has begun to drop following mass production from companies like Tesla. The main difference I have seen is that the quality is improving, you can now achieve a 50% discharge up to 8000 times or an 80% discharge up to 5000 times from a Lithium-Ion battery!
• A Li-ion Lithium battery can be discharged up to 80% 5000 times. With a flooded cell lead acid battery this can be as low as a few hundred discharges. A good quality Li-ion battery will last far longer than a lead-acid battery, this can actually make them a far cheaper option over the life of the battery than a lead-acid battery.
• Li-ion Lithium motorhome batteries can be installed in any orientation. Flooded Lead-Acid celled batteries can only be mounted in an upright position, some AMG and Gel batteries can be laid on their side. If you have limited space, putting a battery in a different orientation can make it possible to install it in an area that you would not normally be able to.