Been looking at lithium batteries to replace an Optima 34-78 in a pulling tractor to save weight. Looks like Antigravity batteries have pretty good reviews but was looking to see if any body on here has experience with them and could recommend the size I need to give the same starting power as the Optima. They are pricey but worth it if I can drop another 20lbs or so. I know they need special chargers and that is ok. Any better options to Antigravity? 

 Thanks