You got a bargain. We bought one five years ago and it was just under $17,000.
We do enjoy being able to talk to each other while riding it, and sneaking up on deer as we drive. It's great for scooting around our property.
But it's far from flawless. We had to replace a couple of batteries a year or two ago. Design is poor and cheap throughout. The gearboxes are very noisy; that's what you hear driving on pavement. Can't run in four-wheel drive without locking rear differential. Charger wants to over-charge and boil the batteries. Flimsy latches on the tailgate that don't want to close properly, cheap switches for forward/reverse, high/medium/low, and "one"/two/or four wheel drive.
But, it's the only one that fits in the little shed we made for our Mule, and the only EV side-by-side with a dealer within an hour's drive for us.
I bought a Polaris Ranger EV about 5 years ago. The FLA (flooded lead-acid) batteries crapped out about two years later, even though kept charged and watered. I don't know how or if they were maintained at the dealer, although I suspect neglect. I was a bit lax about keeping the batteries fully watered until, after the second time dealing with 8 batteries, some of which were hard to get to the cells for watering, I bought a battery watering system with hoses and special cell caps that connected to the system hoses and had valves built in to prevent over-watering.
There is a way to reprogram the charger to minimize over-charging, which I did, and do not remember how, any more.
Solved all those problems with the replacement batteries by switching to Lithium batteries. No more watering, and running them to less than 50% charge does not shorten their life such as would be the case with FLA.
I researched and found batteries that could supply the 650 watt peak current draw - an educated guess on my part, from all the information I could find at the time. Now Google AI says the peak draw is 400A, with the controller rated for 650W burst. I'd go with 650W just to be safe.
I just substituted the LifePo4 batteries in place of the FLA, and wired in the charger that came with the batteries. I left the original charger in place and connected except to the batteries themselves, as otherwise some wiring modifications are needed. Seeing as the Li batteries are about 500 pounds lighter than the FLA, the extra weight of the original charger is negligible. I did wire in a current-sensing coulomb-counting meter to more accurately know the state-of-charge of the Li batteries, as the voltage does not drop linearly with discharge like the FLAs do, rendering the original meter useless.
I'm glad I went to lithium batteries, no more lead-acid where I have a choice. I also expect not to have to replce the batteries for a long time, rather than every 3-5 years with FLA. No more acid eating the battery floor. And no watering needed.
Any one want to buy a used battery watering system?