Batteries:
Random four (4.5Ah) pulled from my skateboards and two 5Ah PowerSonics. I can get all of about 1.5-2Ah out of them.
Charger:
Pair of random SLA chargers.
Controller:
Modified Yi-Yun YK-42 (I think) with 4110 FETs
Conversion time and cost:
Like $300 and too much time.
Curb weight:
30lbs sounds about right.
Drivetrain:
It's a hub motor. The drivetrain is non-existant. :p
Heater:
It's like 90+ degrees around here lately WTF do I want a heater for?
Watt-hours per mile:
No idea since I can't use the Doc Wattson anymore, but I'd venture a guess of around 20-25.