Welcome the Almighty OldMiniBikes!
Where to start.
Please forgive me if this sounds harsh.
They were yet another attempt in the 1970's to use golf cart technology to power vehicles, whether they be cars (Like the Citicar) or minibikes, mopeds, 3 wheel machines etc.
There was a dealer of these Citicar's close to where I grew up, they had 3 of these cars in different colors. They never sold even one and the red one sat there for a good 10 years after that company went south. Scary little monsters.
Citicar here;
https://en.wikipedia.org/wiki/Citicar
Dangerous, all of them, as you are sitting on or near lead acid batteries that can and will get destroyed in a crash and blast you with the acid.
Or maybe explode.
The original companies will never still be in business as they closed as quickly as they appeared on the market.
For your minibike, when found today they pretty much all have this in common. They will all be low miles and not have their batteries and if stored properly be in good shape.
That said, I happen to think they look very cool and love the extra large size of the frame from the standpoint you can jam a really large engine in there. Just strip out the electric motor and assoc. garbage and have at it. Nice big wheels, long wheelbase, great platform for making it your dream layout.
Here is one one of our OldMiniBikes members did up;
https://www.oldminibikes.com/forum/index.php?threads/vintage-auranthetic-w-new-tav-30.25956/
Search of images of bike;
https://duckduckgo.com/?hps=1&q=Aurenthetic+mini+bike&atb=v437-1&iax=images&ia=images
Hope you can do something unique with it.
Best of luck.