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Personally, I would only take advice from someone that has experience with a lithium conversion golf cart. I believe only one of the above fits that criteria. That said, I have limited experience as I have only done a DIY conversion, with Nissan Leaf lithium cells and a few odds and ends in the cart and a cheap Chinese charger. On the plus side, I do not have to charge the battery every time I use it. I will never need to add distilled water to the cells and the cart is faster off the line due to it being 300lbs lighter than the lead acid powered it used to be. I probably have about $500 in parts, BUT I would have had to spend over a grand to replace the lead acid batteries. These lithium batteries will live for about ten years give or take, whereas lead acid batteries are limping along at five years, if that. My lithium battery pack is no where near what most would have in their cart, but this cart will travel maybe ten miles in a trip for shopping. We don't use it for golf. I can build another 48/56volt pack and add it in parallel to get distance, but I don't need it right now. This was an experiment and it is a success. It does not get hot. I have a cell phone App that gives me all the information I need be aware of while using this golf cart and it charges in a couple hours from almost dead, whereas the lead acid batteries required a charging over night. That said, I am still being very careful to watch it for any possible dangers. So far, noting untoward has happened. Yes, I could have spent a grand and gotten a complete package and be done with it. Lead acid is old tech and lithium is newer. I am still watching for a cheaper and more stable power source to become popular. Wind power was considered but once both of us were seated, the darn thing just wouldn't move. Plus the sails and wind mills just wouldn't fit through the tunnels here in the Villages.