After four 18650 batteries are connected in parallel, the voltage can only be 3.7V. If the output current needs to be 2A, then the continuous discharge time will be relatively short if this type of battery is used as a battery. Power supply, the power of the electrical appliance cannot be large, the operating current should be less than 1A.
The voltage of a cell of this type of battery is 3.7 V. Although it is connected to four cells, it can only be charged with a charger that produces 5 V. After parallel connection, the output voltage is 3.7. v and cannot be 5V voltage.
The difference between 18650 lithium battery with battery protection plate and without protection plate is:
1 . The height of the battery core without plate is 65mm and the height of the battery. The core with plate is 69-71mm.
2. Discharge to 2.0 V. If the battery does note does not discharge when it reaches 2.4 V, this means that there is a protection panel.
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: In 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 .