Vapcell's latest 14500. 1500mAh gives us some wild runtimes in the DC0. 

Nominal Voltage : 3.7V
Capacity : 1500mAh
Lowest Discharge Voltage : 2.50V
Cycle Life : > 500 cycles
Max. continuous discharge rate : 3A
Operating Discharge Temperature : -10 - 60 Degree Celsius
Dimensions : 0.560 x 1.925 in
Weight: 21g