3S 20A PCB BMS Li-ion Battery Protection Board 18650 12.6V Lipo Cell Module MS 3 series 12.6V 20A lithium battery protection board (with recovery function auto recovery) 3 series 12.6V 20A lithium battery protection board (with recovery function auto recovery) Scope of application:lithium battery withnominal voltage of 3.6V and 3.7V (including 18650,26650 and polymer lithium battery) Product size:59*20*3.4mm  Product weight: 4.3G Charging voltage:12.6V-13.0v Continuous discharge current (upper limit): 20A (if the heat dissipation environment is bad, please reduce the load current) Continuous charging current (upper limit): 10A Standard Version: applicable to electricdrills with starting current below 40A and power below 65W. Note 1:three 15c-20c power batteries orsix 10c-15c power batteries are required to successfully start the electric dill (the ordinary 18650 cannot start the electric drill!!)If the battery is too small or the power ofthe electric drill is too large, please contact the shopkeeper to tell you the solution. Note 2: connect 0V, 4.2V, 8.4v and 12.6V instrict accordance with the diagram.Do not intentionally short circuit. Note 3:for loads with brush motors,a capacitor(10uf-1000uf)must be connected in parallel at 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. Note 4: when three batteries are connected in series, please ensure that the voltage of each battery is the same. If not, please fill each battery separately and use it in series... During the discharge test, the battery whose voltage drops faster is a poor battery. For some customers with poor electronic foundation, please explain: do not mix good batteries with poor batteries! The closer the capacity / internal resistance of the three batteries is, the better ( Use effect of 2 good batteries + 1 poor battery = use effect of 3 poor batteries). For some customers with poor electronicfoundation,please explain:do not mix good batteries with poor batteries! The closer the capacity / internal resistance of the three batteries is, the better ( Use effect of 2 good batteries + 1 poor battery = use effect of 3 poor batteries). Conditions for successful start of electric drill: Three 15c-20c power batteries or six10c-15c power batteries are required (Ordinary 18650 cannot start the electric drill!!! The distance between the battery packand the protection board shall be as short as possible,and the wire cores shall be in phase as far as possible. When welding the battery for the first time, the output terminal shall not be connected with any load or any equipment. If it still cannot be started, please contact the shopkeeper again to tell you the solution.