Choosing a Battery

[Ether]

Originally Posted by squirrel

it depends on rolling resistance, how much acceleration you want, whether you're going up hill or down hill, if you're turning, etc. And if it's a balancing robot, you're going to have a balancing load...you will probably be driving the motors in an oscillating manner to keep the robot upright, so you will be using power just to stand still

All true.

Try it and see what happens.

I don't get the impression he has a working prototype to try it on.

If he did, he would be able to provide a lot more detailed answers to the questions being asked.