This board is 5 string 3.7V/4.2V lithium battery protection board.High current protection board, continuous 15A currentProtection board with overcharge protection, over-discharge protection, over-current protection, short circuit protection.P+ P- is the abbreviation of PACK+ PACK-, that is, the output of positive and negative polesB+ B-is the abbreviation of battery, which is the positive and negative pole of the battery.PCB board size: (approx.)8.8x1.6cm/3.46x0.63"Detailed Parameters:Discharge: Continuous discharge current: 15A(max)Instantaneous discharge current: 25ACharge:Charge voltage: 21VCharging current: 15A(max)Overcharge Protect:Over-charge detect: 4.28±0.05VProtect delay: 0.5sOver-charge release: 4.28±0.05VOver-discharge Protect:Over-discharge detect: 2.55±0.08VOver-discharge detect delay: 0.1sRelease voltage: 2.9±0.1VShort-circuit Protect:Protect condition: Cut loadDetect delay: 250uSRelease condition: Cut load Over-current Protect:Detect voltage: 150mVDetect delay: 9MSCurrent detect: 30±3ARelease condition: Cut loadInner Resistance: =20mOSelf-consumption:Working current: =30uASleep current: (when over-charge)=10uAWorking Temperature Range: -30-+80?Quantity: 1 PcPackage included: 1 Pcs Li-ion Lithium Battery Protection Board