I would consider lithium batteries if I was buying a new cart. But remember the skate board fires caused by the lithium batteries. I use very small hobby lithium batteries and I keep them in a fire proof box for storage and when charging. I think these type batteries are the way electrical vehicles will go so just be sure safety is considered. By the way I also keep the batteries out side of my house and where if they caught on fire they would do minimal damage.
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