Feature: 1. Built-in high precision voltage detection circuit makes the protection board quick response and protect the battery from damage in time. 2. Overcurrent protection, overcharge protection, overdischarge protection, short circuit protection. 3. The protection board is made with high quality electronic components, stable charge and discharge, with long service life. 4. Wide operating temperature range -40~50℃, low self consumption. 5. Suitable for massager battery pack, LED backup power supply, 12V electronic products, solar street lamp battery pack, monitoring backup power supply, and other products. Specification: Item Type: Lithium Battery Protection Board Overcharge Voltage Range: 4.25-4.35V±0.05V Size: 56 x 45 x 4mm / 2.2 x 1.8 x 0.2inOver-Discharge Voltage Range: 2.3-3.0V±0.05V Upper Limit Working Current: 20-25A (pay attention to heat dissipation) Upper Limit Instantaneous Current: 35-40A Working Temperature: -40~+50°C Storage Temperature: -40~+80 °C Quiescent Current: <30uA Life: >30,000 hours Internal Resistance: <100mΩ Short Circuit Protection: Yes, delay self-recovery Balance Current: 45 mA Charging Voltage: 12.6V-13V Test Point Description: S1 S2 short circuit, P + P- will output voltage, indicating that all MOS protection is normal, plus a normally open temperature detection can extend the temperature protection. Package List: 1 x Lithium Battery Protection Board Note: 1. This protection board can not be used for LiFePo4 battery, xenon lamp, power drill battery pack, electric bicycle battery pack, baby car battery, 775 (4A) above motor, 1W fisheye LED lamp.2. For discharge products above 3A, the battery discharge rate should be more than 3C.Discharge rate calculation formula: 1C rate battery, 2000 capacity is equal to 2AHx1=2A working current; 3C rate battery, 2000 capacity is equal to 2AHx13=6A working current. If battery heats during use, it means the battery discharge rate is not applicable, this situation can not be used for a long time, or the battery will be damaged quickly.3. In strict accordance with the wiring 0V (B-), 3.7V (B1), 7.4V (B2), 11.1V (B+), do not intentionally short circuit!4. When connecting 3 sets of batteries in series, please ensure that the voltage of each set of batteries is the same. If they are different, please fill each set of batteries separately and then use them in series. During the discharge test, the battery with the fastest voltage drop is the poor battery.Tips: Do not mix good battery and poor battery to use! The closer the capacity/internal resistance of the batteries are, the better! (The use effect of 2 good batteries and 1 poor battery = the use effect of 3 poor batteries).