The 18650 we often say refers to the shape of the battery. It is a standard battery model, of which 18 means the diameter is 18mm, 65 means the length is 65mm, and 0 means cylindrical battery. The 18650 battery originally referred to the nickel-hydrogen battery and the lithium-ion battery. Since nickel-hydrogen is now used less, it is now more than a lithium-ion battery.
The nominal voltage of the 18650 lithium-ion battery is generally 3.6V or 3.7V; the smaller discharge termination voltage is generally 2.75V. The common capacity is 1200 ~ 3100mAh, higher than 3400mAh is basically a virtual standard. Most of the explosion-proof flashlights, glare flashlights, and other portable lighting equipment commonly used in lighting equipment use 18650 lithium batteries as the power source.
18650 lithium battery with battery protection board and without protection board, the difference is as follows:
1. The battery without the plate is 65mm height, and the plate is 69-71mm.
2, discharge to 20 V, if the battery reaches 2. 4V will not discharge, indicating a protective plate.
3. Touch the positive and negative levels. If there is no reflection of the battery after 10 seconds, it means that there is a protection board. If the battery is hot, there is no protection board.
Because 18650 battery has the advantages of large capacity, long life, high voltage and stability, it is very suitable for portable lighting equipment such as strong light flashlight.
Some readers have some doubts about the 18650 battery with and without the protective plate. What are the benefits of sharing the 18650 battery with and without the protective plate?
With protection board for all people, there is over-discharge protection: When the battery is running out, the voltage will reach a lower value, the protection board will be closed, and the battery will be shut down. The product will automatically shut down. Over-discharge protection. Overcharge protection: When charging the product, when the voltage reaches the higher voltage ( 4.2V) of the battery , the protection board will automatically turn off and the display will be full and will not continue charging.
An overshoot protection formed. Short-circuit protection: When the battery is inadvertently short-circuited, the protection board will automatically turn off within a few milliseconds, and will not be energized. At this time, the positive and negative poles will touch one piece and it will be fine. A short-circuit protection will not cause an explosion event. Overcurrent protection: When the battery is discharged, the protection board will have a larger current limit. Different products are different. When the discharge exceeds this current protection board, the 18650 battery without the protection board will be automatically closed. The battery is short, and some devices cannot use the battery with the protective plate due to the initial design. Without a protective board, the cost is low and the price is relatively cheap. Lithium battery without protection board, suitable for experienced use, generally do not over-discharge and over-charge, the service life is similar to the protection board.