Samsung lithium-ion Battery

specification
Model: INR21700-30T
Typical capacity: 3000mAh
Minimum capacity: 2900mAh
Nominal voltage:  3.7V
Continuous Discharging Current(MAX): 35A
Life cycle: more than 300 time
weight: 70g
dimensions: 70.3mm x 21.22mm

Samsung
Specification sheet: Download here