So I just got off the phone with the great people at Robot Market Place and had some hard realizations.  A bit good, a lot bad, tons of useful information.

Good:

• Battery packs will only take 30 minutes to charge
• Running like sane person, I'll get about 20 to 30 minutes per battery unit.
• I now know what charger I should get.
• Going to get some PowerPole connectors, they look sturdy and "industrial" enough for quick disconnects.

Bad:

• Running full tilt, I should get about 10 minutes max of life.
• Running full tilt would be stupid and dangerous, note to self, get stunt double, I'm "customer facing" and need to look good.
• I misread the motor voltage, it requires 24V, not 12V
• This means twice the amount of batteries
• I can't hide the charger in the frame anymore.
• I need more chargers than I was expecting due to the increase in amount of batteries
• Running full tilt, expect 10 minutes max out of the batteries.
• I should run 2, 24V 6.6 Amp Hour (Ah) NiMh (nickel-metal hydride) packs (1 per motor) instead of 4 12V 3.3 Ah packs that would be combined in series to up the amperage to 13.2 Ah.
• I may do 24V, run them in parallel to get the 13.2 Ah and a uniformed discharge per motor.
• Another thought is incase a battery pack goes bad, do 8 12V and do a combination of series and parallel to get the 13.2 Ah.
• Per charger, I need a power supply.

So long and short, I doubled the amount of batteries.  This means double the cost.

I really wonder how the hell Segway gets such awesome life out of their batteries.  WikiPedia says they use the same battery type (NiMh) and I can't see them running past 24v and they run in about the same amount of space but I know from personal experience they are able to last for over 4 hours.  I wonder what type of gear box they have in there.

Also I think I found my power switch, a Hella Contour Master Power Switch.  Look at those curves and functionality, ... jesus I'm a nerd.