18650 battery circuit board problem

The difference between 18650 lithium battery with battery protection plate and without protection plate is as follows: 1. The height of the battery core without plate is 65mm, and the height of the battery core with plate is from 69 to 71 mm. 2. Discharge to 2.0V. If the battery does not discharge when it reaches 2.4V, it means there is a protection board. 3. Touch the positive and negative steps. If there is no response from the battery after 10 seconds, it means it has a protective plate. If the battery is hot, it means there is no protection plate. Note: During the third test, non-professionals should not do this experiment, as it may cause a powerful explosion and cause irreparable personal harm, especially when encountering inferior batteries.