The only problem is, if you cant discharge the packs because they dont work in the robot, then you wont be able to cycle them properly.

Even if the batteries do need cycled, they should have enough power in them to turn the wheels, especially if youve charged them once already.

If youve got a multimeter handy, check the voltage across the terminals of the batteries to make sure there isnt a fault in the battery packs first of all.