The 14500 battery is a lithium battery with a diameter of 14mm and a height of 50mm. It is divided into lithium iron phosphate battery and lithium cobalt oxide battery according to the core material. The lithium cobalt oxide battery voltage is 3.7V, and the lithium iron phosphate battery voltage is 3.2V. The voltage can be adjusted to 3.0V by the lithium battery regulator. Since its size is the same as that of the AA5# battery, one 14500 lithium battery and one occupancy barrel can be used instead of two AA batteries. Compared with nickel-metal hydride rechargeable batteries, lithium batteries have the advantages of light weight, less self-discharge and superior discharge performance. Therefore, they are widely used by digital photographers and electronic cigarettes instead of nickel-metal hydride rechargeable batteries.
Comparison of advantages and disadvantages：
Lithium cobaltate is currently the most widely used cathode material for lithium ion batteries. It has mature technology, stable structure, high specific capacity and outstanding comprehensive performance. The disadvantages are poor safety and high cost. It is mainly used for small and medium-sized batteries.
Lithium iron phosphate is a new cathode material for lithium-ion batteries. It has good safety, no explosion, good cycle performance (up to 2000 times), but its energy density is much lower than that of lithium cobalt oxide and ternary materials. More suitable for electric vehicles, power tools and other fields.
Three batteries of the same size and different performance: AA14500 Ni-MH, 14500 Lithium, and No. 5 dry batteries.
The difference is:
1, AA14500 nickel-metal hydride, rechargeable battery. 14500 lithium rechargeable battery. The 5th battery is a non-rechargeable disposable dry battery.
2. The AA14500 nickel-hydrogen voltage is 1.2 volts and is 1.4 volts after filling. The 14500 lithium battery voltage is 3.7 volts and is 4.2 volts when fully charged. The No. 5 battery is nominally 1.5 volts and the voltage is reduced to about 1.1 volts.
3, each has its own application occasions, which cannot replace each other.