Cylindrical lithium batteries are divided into different systems of lithium iron phosphate,lithium cobaltate,lithium manganate,cobalt-manganese mixture,and ternary materials. Batteries with different material systems have different advantages. This kind of battery has high capacity,high output voltage,good charge-discharge cycle performance,stable output voltage,high-current discharge,stable electrochemical performance,and easy to use. Safe,wide operating temperature range,and environmentally friendly,it is widely used in solar lamps,lawn lamps,backup energy,power tools,and toy models.