What is the difference between a 18650 lithium battery with a protection board and no protection board?

What is the difference between a 18650 lithium battery with a protection board and no protection board? 1. The height of 18650 lithium battery without plate is 65mm, and the height of cell with plate is 69-71mm. 2. It can be discharged to any voltage without a protection board. If a protection board is installed, the minimum intelligent discharge to 2.7V will be forcibly disconnected. 3. The discharge current of the battery with the protection board is output according to the maximum value set by the protection board, and the battery without the protection board can reach the standard specifications of the battery. Remarks: In fact, there are still many 18650 lithium batteries without protective plates on the market. Now the technology of 18650 batteries is relatively mature. It also has a relatively mature battery protection mechanism. A method to determine whether the 18650 lithium ion battery has a protective plate. Method 1. The 18650 lithium ion battery has a length of 650mm, and a circular protective plate is provided at the negative electrode above 1mm; Method 2. 18650 lithium The short-circuit current of the ion battery is tested in real time through a 10A or 20A ammeter. If the reading of the ammeter is instantaneous and quickly becomes zero, this means that the 18650 lithium-ion battery has a protective plate. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.