When you start the surgery there will be a red button on the back of Bum.
Rub cream on it to open up the robot. Inside the robot will be lots of 
acid. Vacuum it up. Click the vacuum down on the little dot near the top
of the battery. After all the batteries are fully charged, burn the little
dot on top of the battery to go the next part of the surgery. You will now
see a big battery and four broken yellow circuits. Staple the area where 
they are broken. Charge the area where circuit starts with car battery. 
Then, charge the big main battery in the robot to end the surgery.