I have 3 Hustler Zeon all electric zero turn mowers that I want to convert to li-ion batteries. I’m mechanically savvy BUT all the options and specs make my brain smoke…The mower uses 4 trojan 12v 31xhs batteries. I assume this is similar to a golf cart and have seen a lot of talk on this but all the options on 42-55 etc voltage confuses me. I’d love guidance on making or buying a complete system that includes charger and BMS as safety is key since these mowers are being transported in vans going from property to property. Quick charging is also something I’m interested in, as the vans have solar chargers and recharging as we go would probably help.