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I'd highly suggest sticking with lithium. Their cycle life is rated around 3000 cycles under ideal circumstances. Under those circumstances you can use up to 80% DOD. With lead acid, you get at most 800 cycles at 50% DOD. So lets do some math:
65Ah lithium @ 80% DOD gives 52 usable Ah.
40Ah lead battery @ 50% DOD gives you 20 usable Ah. In order to get 52 usable Ah out of a lead acid battery, you actually need it to be 104Ah. That is a big battery, I know because I have four of them on my riding lawn mower.
Now, you have the same usable Ah, but you still have a battery that weighs a TON more, and is only going to last at most 1/4 as long as the lithium. Also, refurbished batteries won't have near the rated capacity of a new cell.
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