The main specs from Samsung 50E datasheet (pdf):
Capacity (min):4900mAh
Nominal voltage:3.6V
Standard charge current: 2.45A (0.5C)
Charge cut-off current:98mA (0.02C)
Max charge current:4.9A (1C)
Charge end voltage: 4.2V
Max. continuous discharge current:9.8A (2C)
Discharge cut-off voltage:2.5V
AC impedance at 1KHz:≤35mΩ
Max weight:69g