1. Overcharge and discharge protection to prevent overcharge and over-discharge of the battery. Overcurrent protection to prevent abnormal high current from damaging the battery. 2. Balance protection ensures battery voltage balance, helping to extend battery life. 3. Stable heat dissipation performance through aluminum substrate, enhancing safety. 4. TVS safety protection absorbs high voltage surges, reduces MOSFET breakdown risk, with ultra-low internal resistance MOSFETs. 5. Suitable for most electric tools, electric scooters, electric bicycles, electric tricycles, electric motorcycles, electric vehicles, and other similar applications. Product Name: 4S Lithium Battery Protection Board Material: PCB + Metal Color: Silver Model: 4S 120A Balanced with Common Port - 3.2V Continuous Working Current: Up to 120A Momentary Working Current: Up to 300A Charging Voltage: 12.8V - 16V Charging Current: Up to 50A Overcharge Protection Voltage: 3.75V ± 0.025V per cell Over-discharge Protection Voltage: 2.10V ± 0.05V per cell Short Circuit Protection: Yes (short circuit testing is not recommended) Compatible Assembly: Designed for four series nominal 3.2V lithium iron phosphate battery packs Load Power: Up to 1500 watts DC (actual motor starting current less than 300A) Product Dimensions: 56 x 86 x 14mm Features: 1. Optimized circuit design with bilateral MOS channels 2. Enhanced heat dissipation with aluminum heat-dissipating sheet 3. 2oz thickened copper layer on PCB for improved conductivity 4. High-quality imported Hongkang IC 5. 20 high-power MOSFETs mounted on both sides Package Contents: 1 x 4S Lithium Battery Protection Board 1 x Battery Sampling Cable Note: Light shooting and different displays may cause slight color variations between the image and the actual item. Measurement allows an error of +/- 1-3cm.