With a lot of luck and some cheap prices I raised the money and now have three three speeds

The guy has owned it from new and it was only run on carpet. He was a spray painter by trade and the paint work is near perfect.
It came with the 4000mah 6v battery too, Do you think I could try to charge it up or just keep it as a prop? I was a bit worried about trying to charge it. Dont want to start a fire or anything.
As a bonus he threw in some Blazer wheels and tryes along with an 84 guide book. (Guide book is in German lol)
Let me know what you reckon.