[Al Skierkiewicz]

Bob.
Congratulations to your team on a spectacular paper demonstrating battery life and operational issues in FRC robot batteries. I can suggest that your battery ranking likely points at batteries that have had more charge/discharge cycles than others. This could explain the unexpected ranking of older batteries but also may be influenced by the robot design used in the years you have owned those batteries. Can I suggest that teams that might participate in your study also perform a long term (over several years) data collection of charge/discharge cycles for each battery and if possible some form of classifying current demand by robot. With no formal data, I have observed some robots that will drain a battery in a single match while others with more efficient designs can typically run two or three mtaches without using a fresh battery. Your students should be very proud of the work they have performed.
Al