TECNOIOT 5pcs 4S 40A 14.8V 16.8V 18650 Lithium Battery Protection Board BMS PCB + Nickel Strip

【4S40A】 4S 40A 18650 lithium-ion battery protection board. 【compact design】 Charging voltage: 16.8V ~ 18.1V; Continuous discharge current (upper limit): 40A (If the cooling environment is not good, please reduce the use of charging current); Continuous charging current (upper limit): 20A; Size: about 45x55x3.4mm / 1.8x2.2x0. 13"; Scope: Rated voltage 3.6V, 3.7V lithium battery (including 18650, 26650, polymer lithium battery). 【Easy operation-1】1. Please allow little size deviations due to human measurement.2. This item is an upgraded version of BMS PCB without any charge matched.3. The successful start of the drill requires four 10C-20C electric batteries or eight 5C-10C electric batteries (ordinary 18650 cannot start drilling!). 【easy operation-2】 4. According to the 0V, 4.2V, 8.4V, 12.6V, 16.8V wiring guide, please do not touch any of the components on the board while soldering the wire to avoid short circuit. 5. When soldering the battery for the first time or charging, whenever a single battery exceeds 4.2V, the 430 resistor will heat up and discharge (stopping heating when it discharges to 4.19V or less). 【easy operation-3】6. When connecting 4 battery groups in series, please make sure the voltage of each battery group is the same. If they are different, charge each battery bank individually and reconnect them in series. In the discharge test, the battery with the fastest voltage drop is a lean battery.