The bike was purchased as is. Dusty from indoor storage. Molding tits still on tires. Protective film still on display. Battery obviously failed over years of storage since 2016? Rode as a conventional bike with no issues while researching battery options. Temporary attachment of replacement battery shown. Odometer shows 149 miles when powered. After the first powered ride the crank would not fully engage. Learning curve, all square shafts are not the same dimension. Universal tool purchased screws into crank as expected but refused to push off. Finally cut crank on right side to remove. Discovered that bearing cap on tool is larger than the square. Engineered a way to push and left crank came off as designed. Preparing to disassemble drive. 40+ years as a hands on troubleshooting electrical/mechanical engineer, now to see what this is made of and how it works!