1.4 series 16.8V 40A lithium battery protection board (with own recovery function - AUTO Recovery);2. Integrate 10 imported low internal resistance MOS tubes, continuous discharge 40A, 100mA balanced current, suitable for electric drills, sprayers, LED lights, low- inverters;3. Scope of application: suitable for nominal voltage 3.6, 3.7V (including 18650, 26650, polymer lithium battery), 4.2V lithium battery with full voltage4. Suitable for electric drills with starting current below 80A and below 230W, with balanced charging function5. The high current heating is reduced by 30%, and the anti-interference function is increasedConditions for successfully starting the electric brick:1, 4 15C-20C batteries or 810C-15C batteries (ordinary 18650 drills are required 2. The connection line between the battery pack and the protection board should be as short as possible and as thick as possible;3. When welding the battery for the first time, do not need any load or any equipment at the output end.4. If it still can't , please contact the shop king again to tell you the solution.Precautions:1: 4 10C-20C batteries, or 8 5C-10C batteries are required to successfully the electric drill (recommended battery models: VTC4, VTC4A, VTC5A, VTC6) 0V and 12.6V connecting cables, 3 mm above copper wire ( cannot be used )2: Strictly 0V, 4.2V, 8.4V, 12.6V, 16.8V according to the , and do not touch any components on the board when soldering the wires, and do not intentionally short-circuit.3: When the battery is welded for the first time or is being charged, as long as a single battery exceeds the 4.2V430 resistance, it will heat up and discharge (discharge to about 4.19V and stop heating). If the 430 resistor is seriously hot ('t dare to touch it when it is too hot), please check whether the wiring is wrongProduct weight: 10.3gColour:greenMaterial: PCBSize:45 x 60 x 3.4mmPackage Contents:1 x 4 string equalizer boardOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.