The Samsung 30Q 18650s are perfect for getting that extra charge out of your batteries. 

Specs

• Brand: Samsung SDI
• Model: 30Q
• Size: 18650
• Nominal Capacity: 3000mAh
• Nominal Voltage: 3.6V
• Maximum Voltage: 4.2V
• Discharge Current: 15A Maximum Continuous
• Style: Flat Top
• Approximate Dimensions: 18.33mm x 64.85mm
• Approximate Weight: 48g