1 x 18650 3.7v 3.6v 2600mah Li-ion Battery
battery voltage: 3.7v
battery capacity: 2600mah
battery type: li-ion rechargeable
brand selection: Samsung/LG/CHINESE branded
you can also choose: 1x18650 with PCB, or 1x18650 without PCB
what's the function of PCB?
Answer: battery PCB is kind of protection system for battery management use. to choose a proper PCB is very import to save battery from unexpected unsafety factors.