We purchased these Powerwheels off of our local classifieds for $20 or less each. They had bad batteries. Knowing what I know about batteries I never purchased replacement batteries from Powerwheels ($65+ each). I modify the toys to run off of normal connectors so I can hook them up to regular SLA batteries ($25 each).
I also modified the red Harley from using two 6 volt batteries to use a 12 volt battery like the others.
As you will see in the video; We ride them as well! The neighbors laugh at us, I think they are just jealous!