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Also, keep in mind that, more or less, Volts = Speed and Amps = Power.
But, because voltage sags as you pull lots of amps, this can lead to a strange situation in which if you are going up a hill, pushing the pedal further down increases amperage out of the batteries, which drops your volts, which lowers your speed!
You could actually go faster by letting UP on the gas pedal a bit.
Since volts x amps = work, and volts drop off as your battery drains, you pull more amps to do the same work on the lower end of the battery pack. Now that you are pulling more amps, you drain the batteries that much faster. I think that's a big part of the reason why batteries seem to drop off quickly at the end of the pack - it's sort of a vicious cycle.
The thing is to have a large enough pack, and DON'T BE RUNNING IT ALL THE WAY DOWN ALL THE TIME! They don't like that.
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