Just some background. I just picked up an MX500 and was going to wait on mods until later. This has been sitting in a storage shed for 2 years, in the box. Grandparents bought it and the parents said no way, then covid hit. I can get about 20 minutes out of a charge, so pretty sure the batteries are on their last leg due to sitting for so long. I was going to wait to decide on lithium or not, but now I have to decide. Is it possible to get 48v lithium setup for under $200? If I'm going this route, I'll go ahead and do the 800W motor and 48v 1000W controller at the same time. Suggestions?