[Greg Needel]

This is the rule you are talking about, and there is no maximum and it only applies at the begining of the match.

<R02> Energy used by FIRST Robotics Competition robots, (i.e., stored at the start of a match), may only come
from the following sources:
• Electrical energy derived from the onboard 12V and 7.2V batteries
• Compressed air stored in the pneumatic system, but only supplied by the compressor included in the kit,
and stored at a maximum pressure of 120 PSI in no more than two Clippard Instruments tanks.
• A change in the altitude of the robot's center of gravity.
• Storage achieved by deformation of robot parts. Teams must be very careful when incorporating springs
or other items to store energy on their robot by means of part or material deformation. A robot may be
rejected at inspection if, in the judgment of the inspector, such items are unsafe.