Model	Nominal Voltage	Rated capacity
18650Fe-2P1S	3.3V	2.8AH
18650Fe-3P1S	3.3V	4.2AH
18650N-2P1S	3.6V	4AH
18650N-3P1S	3.6V	6AH

Summary: small size, light weight, high energy density, long cycle-life, low self-discharge, no memory effect, green, safety and reliability.