Martijn: In that case you would have 2 options: Either get the proper stats for existing batteries and do the actual calculations, or resort to the battery packs provided in the vapourbot section. Of course these packs would be based on actual existing packs, so the are not just picked random numbers.

@paul: It does mean that if you put down your motors in your stats, you will also put the batteries in the stats, and you will have to keep into account the size and weight of them in your stats so they will fit in your robot and your robot has enough weigh left over. It is not a get out of jail free card.