Is it possible to power Vex with a 4.8 Volt battery or 4 1.5 Volt batteries? If yes, how can this be done?
This power would only be needed for 1 min - and the robot just has to go straight for that period of time
We can not guarantee operation at those low voltage levels. It may or may not work. To use few batteries, you would need to modify the battery holder which we do not support - If a battery became shorted due to your modifications, the battery can explode.