[Al Skierkiewicz]

The robot batteries, if fully charged when stored, can be left for several months without damage. They will need to be recharged prior to use as each month will drain a little charge. They should not be stored in temperature extremes, i.e. less than 32 or greater than 90 F for any length of time.
Robot batteries have a finite life of 400 charge discharge cycles. If your design drains a battery in one match consider that life to be reduced significantly. I would suspect that such a robot could easily reduce that life to 200 cycles or less.