Lishen LR2170SD 3.7V 21700 Rechargeable Li-ion Battery
Size: 21mm x 70mm
Capacity: 4900mAh
Voltage: 3.7V
Max Continuous Discharge: 9.6A
Characteristic: Flat Top (NOT Button Top), No Memory Effect, High Energy Density, & Pollution-free
What you get: 2x Lishen LR2170SD 21700 4900mAh Flat Top Rechargeable Battery