The Samsung 20S not only has increased capacity over the other 30 amp 18650 HB2/4/6 from LG, but also performs much better.
Nominal Voltage: 3.6V
Maximum Voltage: 4.2V
Minimum Voltage: 2.5V (Do not drain below this)
Operational Charging Temperature Range: 0 to 50°C (best below 45°C)
Operational Discharging Temperature Range: -20 to +75°C (best below 60°C)