Description Application :This is The BMS for 3S ~8S Li ion /Lifepo4/ LTO /SIB battery   with 120A constant constant discharge current ,Which would be applied for different project based on your battery specification  Function :This BMS has such basic functions : over-charge protection ,over-discharge protection, over-current protection , short-circuit protection. Balance , High temperature protection etc  Advantages :This BMS was build with high end Integrated electronic components (High End IC and MOSFET ) ,simple structure design will let it have more stable quality working performance . Specification reference :    Rated constant discharge current : 120A    Peak start Current : Max 300A    overcharge detection voltage :4.25V For Li ion NCM Battery /3.65V For lifepo4 battery/2.85V For LTO Battery/3.95V For SIB Battery /    Overcharge release voltage :4.05V For Li ion NCM Battery /3.5V For lifepo4 battery/2.75V For LTO Battery/3.80V For SIB Battery /    over-discharge detection voltage :2.75V For Li ion NCM Battery /2.3V For lifepo4 battery/1.7V For LTO Battery/1.50V For SIB Battery /    Over-discharge release voltage :3.0V For Li ion NCM Battery /2.7V For lifepo4 battery/1.8V For LTO Battery/2.00V For SIB Battery /    Over-current protection current :150±10A    Short Protection current : 500A    Self-consumption current  in working process : less than 25uA    Balance start voltage :3.7V For Li ion NCM Battery /3.45V For lifepo4 battery/2.5V For LTO Battery/3.00V For SIB Battery /   Working temperature :-40~85°C Connection instructions :    1. please use short and Bold wire to Connect B- to the Battery negative Port ,and then connect wires to the Battery at first , then plug connector into the BMS ( wrong connection order will damage the BMS surely )  2. Warning : the wire from  B- to battery negative port should be short and bold enough to prevent wrong protection action from the BMS during charge and discharge ,    P- and P wire should use bold wire also , the thin and long wire for connection P and P- will have the risk to burn the BMS please take much attention on these poins kindly Shipment :  Please choose the shipment way as you like ,you you can consider express delivery way if your order is urgent , but you should afford the extra freight cost by express delivery .   As post by air ,usually it takes around 15·25 days ,please notice it and do not open the disputes easily before reaching the contact with us ,we will try our best to solve the problem with our joint efforts .  Transaction terms : We guarantee the product  from us with a 12 months warranty against defects in quality, but we are not responsible for buyers’ mistake or wrong handling, our product must be maintained in proper way. If Item is defective and not working on arrival, please report the item to us within 7 days of receiving the defective product so we can issue a RMA. Please contact us to request a return authorization. Please include your name, auction number, and reason for return when you contact us. All items returned must contain all original packaging materials. Please carefully repack the item. Items returned will be tested and if found defective, the buyer will be shipped a new replacement unit immediately. In the event that a suitable replacement is not available a refund will be issued. The return shipment cost should be afforded by buyer if you can not accept our policy  ,please do not buy the item from us ,fair deal is importable for both of us .     You satisfaction and positive feedback is very importand to us. Pleae leave positive feedback and 5 stars if you are satisfied with our items and services.  If you have any problems with our items or services, please feel free to contact us first before you leave negative feedback. We will do  our best to solve any problems and provide you with the best customer services.