Diameter 18mm
Length 65mm
Same for the other two
Applicable occasions can generally replace ordinary batteries of the same size (but the single voltage is the same as regular batteries) About double that, either connect them in parallel or in series with a dummy battery), the size of the 5th is probably the same as the 14500. You can roughly understand it as a lithium battery with this shape. It has the advantages of stable voltage, large current and fast charging, but the capacity is lower than that of ordinary rechargeable batteries.
The complete list of ordinary rechargeable batteries. The battery models for bright flashlights are as follows:
1. AAA and AA: These two types are AA and AA batteries, which are smaller and are often used in low-power devices, such as flashlights.
2. VSR123A: This is a disposable lithium battery, the size is the same as 16340, and the maximum voltage is 3V.
3. 14500, 16340, 18650, 26650: These are common lithium battery models. 14500 is a lithium-ion battery with a diameter of 14mm and a height of 50mm. AA battery, but the voltage is different. The 18650 battery has a diameter of 18 mm and a length of 65 mm, which makes it an economical battery.
4. 21700 and 26800: These two lithium batteries are newer in recent years. They are larger, have high energy density and are suitable for high-power equipment.