Assuming 1A load while moving @ 7.4V, with two motors
2 * 1A * 0.5h is 1amp-hr capacity for an rc nimh or nicad 7.4v battery pack
But, it is best to test this in real life, as it depends on weight of robot, surface you are on, speed and more.
Btw, use a separate usb battery pack for the pi etc
Will5455 wrote: ↑
Mon Dec 10, 2018 5:15 pm
now a important question. Any battery for at least 30 minutes of playtime?