Feature:1. Built-in high precision voltage detection circuit makes the board quick response and protect the battery from damage in time. 2. Overcurrent protection, overcharge protection, overdischarge protection, short circuit protection.3. The board is made with high quality electronic components, stable 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 BoardOvercharge Voltage Range: 4.25-4.35V±0.05VSize: 56 x 45 x 4mm / 2.2 x 1.8 x 0.2inOver-Discharge Voltage Range: 2.3-3.0V±0.05VUpper Limit Working Current: 20-25A (pay attention to heat dissipation) Upper Limit Instantaneous Current: 35-40A Working Temperature: -40~+50°CStorage Temperature: -40~+80 °CQuiescent Current: 30,000 hoursInternal Resistance: <100mΩ Short Circuit Yes, delay self-recoveryBalance Current: 45 mACharging Voltage: 12.6V-13VTest Point Description: short circuit, P + P- will output voltage, indicating that all MOS is normal, plus a normally open temperature detection can extend the temperature protection.Package List:1 x Lithium Battery BoardNote:1. This board can not be used for LiFePo4 battery, lamp, power drill battery pack, electric battery pack, baby car battery, 775 (4A) motor, 1W fisheye LED lamp.2. For discharge products 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=