Here is link for the charger. It works great!!!
http://www.lvssales.com/index-Chargers.html
Here is the wiring diagram I used.
http://www.alltraxinc.com/files/Doc1...6-wire-dia.pdf
This is a great document to read that explains alot about the upgrade you are planning.
http://www.alltraxinc.com/files/Doc1...ns-Learned.pdf
Here is the best price I found for the PB-6 pot box.
http://store.kta-ev.com/curtispb-6potbox.aspx