1,Overcharge and discharge protection to prevent overcharge and discharge of the battery. Overcurrent protection to prevent abnormal high current of battery 2,Balance protection, battery voltage balance, make battery life longer 3,Stable heat dissipation, stable heat dissipation of the aluminum substrate, 4, safety protection absorbs anti-high voltage, reduces MOS tube breakdown, ultra-low internal resistance MOS 5,Suitable for most electric tools on the market, electric scooters, electric bicycles, electric tricycles, electric motorcycles, electric vehicles, electric tools, etc. Product name: 4 strings lithium battery protection board Material: PCB+Metal Color: silver Model: 4S 120A balanced with the same port-3.2v Continuous working current: within 120A Momentary working current: within 300A Charging voltage: 12.8-16V Charging current: within 50A Overcharge protection voltage: single cell 3.75V+/-0.025V Over-discharge protection voltage: single cell 2.10V+/-0.05V Short circuit protection: Yes (short circuit test is not recommended) Applicable assembly: three strings of nominal 3.2V lithium iron phosphate batteries Load power: DC 12V within 1500 watts (actual motor starting current is less than 300A Product size: 56 x 86 x 14mm advantage: 1. Optimized line, bilateral mos channel 2. Increase the heat dissipation aluminum sheet 3. Thicken the copper skin of the circuit by 2oz 4. original for Hongkang ic 5. 20 high-power mos on both sides Package Contents: 4 x 4 series lithium battery protection board 4 x Sampling cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.