[DampRobot]

Originally Posted by AlecS

The voltage the battery outputs is proportional to the amperage being drawn, and the resistance of the circuit. This is also known as ohm's law.

V=IR

Although batteries are not always perfect voltage sources, you can use ohm's law to determine the voltage drop in your robot fairly accurately. If you were drawing 300 amps, and the total circuit resistance was .020 ohms, you would lose 6 volts.

So, theoretically, we should be designing to maximize power out of our battery as well as out motors? IE load the battery such that V^2/R is maximized when you think you'll need the most power as possible (pushing matches).