to be more precise, here is what happens when I use my VR 408 on battery and without USB wire: Our robot is working fine when I hold it in my hand, but as soon as I put it on the floor, it begins to bug. It seems that it doesn’t have enough energy to stand up and it seems to try to restart again and again without any success. But if I plug the USB, it starts to move correctly.
But of course, I don’t want to keep my robot on a lead. It’s very disappointing, especially for my sons who are discovering Arduino with this device. Could you help me please?