18650 Sanyo Panasonic Lithium Ion Battery 3500mAh Rated Capacity with a 10A constant discharge.
A very high quality brand of battery from a reputable and respected brand. 
The Panasonic-Sanyo GA is an outstanding high-capacity cell that provides up to 10 amps of maximum continuous discharge current. It has an energy density of 693 watt-hours/liter, the highest energy density of any commercially-available lithium-ion cell. It's a popular choice for electric vehicles, electric bicycles/scooters, flashlights, and vape pens. These are authentic cells and they have been tested to ensure that they meet or exceed the manufacturer's performance specifications.

• Rated capacity: 3500mAh
• Min. capacity: 3350mAh
• Standard capacity: 3450mAh
• Standard charging current: 1475mA
• Max. continuous discharge current: 3C (10A)
• Test capacity: 3518.3mAh
• Test environment: 4.2-2.7V, 1000mA discharge