What is the C-value on rechargable batteries?
Thanks to TomCarpenter's comment, I found the answer:
Except from Wikipedia:


  The C-rate is a measure of the rate at which a battery is being discharged. It is defined as the discharge current divided by the theoretical current draw under which the battery would deliver its nominal rated capacity in one hour. A 1C discharge rate would deliver the battery's rated capacity in 1 hour. A 2C discharge rate means it will discharge twice as fast (30 minutes).


Hence my battery is capable of discharging as fast as 1/15 of an hour.