3 strings of 12.6V 20A lithium battery protection board (with recovery function - AUTO Recovery) Scope of application: lithium batteries with a nominal voltage of 3.6V and 3.7V (including 18650, 26650, and polymer lithium batteries) Continuous discharge current (upper limit): 20A (if the heat dissipation environment is not good, please reduce the load current) Product weight: 4.3g Charging voltage: 12.6V - 13.0V Continuous charging current (upper limit): 10A Standard version: suitable for electric drills with starting current below 40A and power below 65W. Enhanced version: suitable for electric drills with starting current below 60A and power below 100W. Note 1: Three 15C-20C power batteries, or six 10C-15C power batteries are required to successfully start the electric drill (ordinary 18650 cannot start the electric drill!!!); if the battery happens to be too small or the power of the electric drill is too high Some of them cannot be started, please contact the store owner to tell you the solution. Note 2: Wiring 0V, 4.2V, 8.4V, 12.6V strictly according to the diagram, do not intentionally short circuit. Note 3: When there is a load with a brush motor, a capacitor (10uF-1000uF) must be connected in parallel to the positive and negative terminals of the motor to prevent the reverse peak voltage generated by the motor from interfering with the protection board or breaking down the MOS tube. size: 59 x 20 x 3.4mm Material: PCB colour: green Package Contents: 5 x PCB Protection Board