Cylindrical Lithium-ion Battery Made in China INTRODUCTION Product of Sum Cylindrical lithium battery pack design Main types of cylindrical lithium batteries: 14 series：14430、14500、14700 18 series：18500、18350、18650、18700 21 series：21700 26 series：26650 32 series：32650 Applications: Instrumentation, medical/ financial / commercial/ security/ power equipment, robotics, power storage, emergency...