The lithium battery has a protective plate, which can control the lithium battery cell to work in the specified working environment without explosion or combustion; the lithium battery without the protective plate is prone to explosion, burning and other phenomena.

The battery with the protection board can be protected at 4.125V for charging protection voltage, 2.4V for discharge protection, and the charging current can be within the maximum range of the lithium battery; the battery without protection board will be overcharged and overdischarged , Overcurrent, the battery is easily damaged.

Why add a lithium battery protection board? Because the working environment of lithium batteries has special requirements, it cannot be overcharged, overdischarged, overheated, and overcurrent charging and discharging is not allowed. It will be broken, and it will also cause serious social problems such as fires.

What are the advantages of 18650 battery with and without protection board?

The 18650 that we often talk about today actually refers to the battery's appearance and specifications, which is a standard battery model, where 18 means a diameter of 18mm, 65 means a length of 65mm, and 0 means a cylindrical battery. 18650 batteries originally referred to nickel-metal hydride batteries and lithium-ion batteries. As nickel-metal hydride is now less used, it now refers to lithium-ion batteries. The nominal voltage of a single cell of 18650 lithium-ion battery is generally: 3.6V or 3.7V; the minimum discharge termination voltage is generally: 2.75V. The common capacity is 1200～3100mAh, higher than 3400mAh is basically a virtual standard. Most of the common explosion-proof flashlights, glare flashlights, and other portable lighting equipment in lighting equipment use 18650 lithium batteries as power sources. Because the 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 flashlights.

Some readers have some questions about the 18650 battery with protection board and without protection board. What are the advantages of 18650 battery with protection board and without protection board?

The protective plate is suitable for all people and has over-discharge protection: when the battery is about to run out, the voltage reaches a required minimum value, the protective plate will also be turned off, and it cannot be discharged, so the product will automatically shut down, forming a kind of Over-discharge protection. Overcharge protection: When charging the product, when the voltage reaches the maximum voltage of the battery (4.2V), the protection board will automatically cut off the power and turn off, indicating that it is full and no longer charging. The formation of a kind of overshoot protection. Short-circuit protection: When the battery is accidentally short-circuited, the protection board will automatically shut down within a few milliseconds and will not be energized. At this time, it will be fine if the positive and negative poles touch one, and the formed short-circuit protection will not cause an explosion. Overcurrent protection: When the battery is discharged, the protection board will have a maximum current limit. Different products are different. When the discharge exceeds this current, the protection board will automatically shut down.

The size of the 18650 battery without the protective plate is shorter than the battery with the protective plate, and some devices cannot use the battery with the protective plate due to the initial design. Without the protection board, the cost is low, and the price is relatively cheaper. Lithium battery without protection board is suitable for experienced use, generally do not over-discharge and overcharge, the service life is similar to that with protection board.

18650 lithium battery, with battery protection board and without protection board, the difference is as follows:

1. The battery core without a board is 65mm in height, and the battery with a board is 69-71mm.

2. Discharge to 20V. If the battery reaches 2.4V, it will not discharge, indicating that there is a protection board.

3. Touch the positive and negative levels. If there is no response from the battery after 10 seconds, it means there is a protective plate. If the battery is hot, there is no protective plate.