Batteries:
3, 12V scooter batteries from China (stock)
Charger:
Rad2Go 36V, 1.6 A charger
Controller:
Stock Rad2Go E-36 controller
Conversion time and cost:
$170 used off eBay (new they are ` $500); repair/update costs of ~ $40 so far
Drivetrain:
36V, 800W motor; 11t primary gear
Lighting:
LED blinking tail lamp for conspicuity - working on LED headlight - both with independent batteries