Golf cart batteries

Get you a good lithium battery. It will last forever and is worth the price

Id say most people on the resale market would be drawn to Lithium

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Should I go back with lead acid batteries, a cheap lithium or a higher tier lithium battery?

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All I can advise is to never, ever go with a cheap lithium battery option.

lead acid if you aren't gonna keep it

Golf carts a a dime a dozen now on marketplace and everywhere else. You are already making a profit if someone gave it to you. How much you put in on batteries will determine how much less profit you make when you sell it. You are already at a bit of a disadvantage with it being a 36 volt vs 48 volt.

Get some Sam’s Club 6volts, enjoy it for a while and sell it on.

If you plan to sell it then sell it without the batteries. You are not going to get more out of it than you pay for the batteries and the buyer can buy what they want not what you bought.

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I’d look into it but if you change to lithium you may have to change more than batteries.

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I think if you get a pack with BMS built in it should be a drop-in replacement as long as you match the voltage. At least that's what I've read and hope is true because I'm about to do the exact same thing as OP.

And OP, get LiFePO4

If you plan to keep it for a long time then invest in a lithium upgrade. They are much lighter and last longer. And your cart will perform better due to significantly reduced weight. But you're looking at at least $2000 for the upgrade if you do it yourself. Probably $3k if you get someone else to install. If you're looking for a cheaper option I would get the interstate batteries from costco. They will run you about $100 each and last 4-5 years if properly maintained. And if anything ever goes wrong with them Costco will replace at prorated value and they don't really ask a lot of questions. So realistically you can return them and get new batteries every year if you want. I learned this when my charger's auto shutoff malfunctioned and my batteries (13 months old) were ruined due to overcharging. I called costco and asked if there was anything they could do to help me and they said just bring them back and we'll replace them. And when I did, they actually gave me about $6-7 dollars cash back along with all new batteries because the price had come down about $1 each since my original purchase. That was a pleasant surprise.

Eta: just realized you intend to sell it. Definitely go with lead acid batteries from sams or costco and offer the reciept when you sell it.