The LG HG2 (full part number INR18650-HG2 or LGDB1865), sometimes lovingly referred to as the LG Chocolate, is an amazing battery for people who need high capacity with high current output.
This battery is rated very conservatively and outperforms many of the Chinese batteries with much higher amp ratings.
Max Continuous Discharging Current: 20A Typical Capacity: 3000 mAh
Flat top Dimensions: 65.2 x 18.5 mm
Recommended discharge cut-off voltage: 2.0V