Well, 2 years ago I bought 8 6v GC2 golf cart batteries, 220ah, from Sam's Club for $85/ea. So $680 plus core and tax for a 220ah, 48v or let's see... 10.56 kw/hr. so call it $64.4/kwhr. Lithium has a lot of advantages, but for getting a foot in the door cheaply, the golf cart batteries are the way. I simply could not afford Lithium, period.
I think one reason LEV builders favor lithium is the energy density. More kw/hr per pound of weight. Weight is not as much of an issue in a boat, generally. For a land vehicle the weight penalty when climbing hills or stop and go (well, the go part, anyway) is a significant impairment. So on top of all the other advantages of lithium, for wheeled vehicles, there is the weight issue as well.
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