We should add a cheapest list of chargers. My full wave bridge charger cost me $2 for a 120V Nicad pack or 126V flooded lead pack. It is setup to trickle charge at end charge.

Cheapest controllers and adaptors and batteries are possible

Hey Coulomb,
I am on a business trip in Brisbane from the US. I see that you are also in Brisbane. I am still working on optimizing my controller for the prius inverter and motor and I also developed my own low cost cell voltage monitoring daisy chain. Send me a PM if you are interested in meeting up and talking shop.
Regards
Jeff