In fact, there are three types of batteries with the same size and different performance: AA14500 NiMH, 14500 LiPo, and AA dry cell. Their differences are:

1. AA14500 NiMH, rechargeable batteries. 14500 lithium rechargeable batteries. 5 batteries are non-rechargeable disposable dry cell batteries.

2. AA14500 NiMH voltage is 1.2 volts, 1.4 volts when fully charged. 14500 lithium voltage is 3.7 volts, 4.2 volts when fully charged. 5 battery nominal 1.5 volts, the voltage drops to 1.1 volts or so abandoned.

3. Each has its own use occasions, each other can not be replaced.

AA batteries and 14500 battery size is the same

14500 is the battery height is 50mm, diameter is 14mm

AA batteries are generally referred to as disposable batteries or nickel-metal hydride nickel-cadmium batteries, 14500 is generally the name of the lithium-ion batteries

Is the diameter of 14mm, the height of 50mm lithium battery, according to the cell material is divided into lithium iron phosphate and lithium cobalt acid batteries. Lithium cobalt acid battery voltage 3.7V, lithium iron phosphate battery voltage 3.2V. through the lithium battery regulator can be adjusted to 3.0V. due to its size and AA batteries, a 14500 lithium battery and a placeholder barrel with, can replace the use of two AA batteries. Compared with NiMH rechargeable batteries, Li-ion batteries have the advantages of light weight, less self-discharge and superior discharge performance, so they are widely used in digital cameras and electronic cigarettes by photography enthusiasts, replacing NiMH rechargeable batteries.

There are two kinds of 14500 lithium batteries, one is 3.2V lithium iron phosphate, and one is 3.7V ordinary lithium battery.

So whether it can be universal, it depends on whether your appliance is using 1 AA battery or two.

If it is a one battery appliance, under no circumstances can be common with the 14500 lithium battery.

If it is a two-battery appliance, in the case of pairing with a placeholder barrel (dummy battery), a 3.2V 14500 lithium iron phosphate battery can be completely universal. And 3.7V of 14500 lithium iron phosphate batteries may be universal, but the match is not optimal.

Because 14500 lithium battery voltage is 3.7V, ordinary AA is 1.5V, the voltage is different. Change the lithium battery, the appliances may be burned to trigger the danger.