Charge\discharge cycle characteristics
How many cycles before 10%, 25% and 50% loss of battery capacity?
I'm sure this is proprietary information that won't be officially released. However, they use 18650 cells (if you do some research online, or take apart a battery you could probably even find out the brand/make) so you might be able to look up that information based upon the cells they use inside their battery and interpolate from that. (Also keep in mind that LiIon batteries degrade over time (calendar life) in addition to the number of cycles.)