Hello, my MS is still in production, so still waiting. I was wondering if someone had the exact spec/group size of the 12v aux battery. I plan on ordering a Lithium Drop In replacement for it. I import products from China, and a couple of my off the beaten path suppliers are testing some drop in replacement Lithium Starting/Deep cycle batteries for Auto, Cycle and Marine use, and would like to switch to one of those, and if it works good, I am going to start importing them. They charge Much quicker, more energy dense, are not "damaged" like lead acid is by discharges etc... Thanks All!