HIGH-ACCURACY, HIGHLY DURABLE: High-accuracy voltage detection circuit, fine workmanship and durable, Effective life greater than 50000 hours. MULTIPLE PROTECTION: Over-discharge protection, overcurrent protection, overcharge protection, short circuit protection; A combination of 4 safety features that work together to provide ultimate protection for your devices, your chargers and most importantly:you. LOW STANDBY CURRENT: MOS transistor can control the battery charge and discharge, low standby current consumption. WIDELY APPLICATIONS: Use for variety of capacities and various shapes 3.7V lithium batteries,Massager battery pack, LED light backup power supply, solar street light battery pack, monitor standby power supply, etc. ATTENTION: Strictly according to the diagram wiring: B+: connected battery positive, B1: the connect point between battery 1 and battery 2, B2: connect the point between battery2 and battery 3 , B3: Connect the point between battery 3 and battery 4, B-: connect to battery negative end , P+: connection charge / discharge positive, P-: connection charge / discharge negative. Otherwise it will cause damage to the chip. Do not mix the good battery and poor battery to use. With over charge, over discharge, over current, short circuit protection function, for a variety of different shapes of 3.7V capacity lithium batteries. Well-designed, comprehensive test. Compact size, suitable for many requirements of high integration, low cost occasions, can meet the performance requirements of many aspects, to ensure the absolute safety of the battery group.

Specifications:
Over Charge Voltage:4.25-4.35v±0.05v
Over Discharge Voltage: 2.3-3.0v±0.05v
Upper Limit Operating Current: 4-5A
Max Peak current: 6-8A
Max instantaneous current: 12A
Working Temperature: -40~+50 Celsius
Storage Temperature:-40~+80 Celsius
Static current: less than 6uA
Life cycle: more than 50000hours
Resistance: less than 45mΩ
Charging Voltage: 16.8-17V
Short circuit protection: Can be protected, charge recovery required
Size: 67mm x 16mm x 1mm/ 2.64″ ×0.63″×0.04″(L x W x H)

Suitable for:
14.8V (Li-ion 18650 or li-ion battery rated voltage)
16.8V (Li-ion battery full charge voltage)
14.4V ( Lipo battery pack rated voltage)

Attention:
Strictly according to the diagram wiring: B+: connected battery positive, B1: the connect point between battery 1 and battery 2, B2: connect the point between battery2 and battery 3 , B3: Connect the point between battery 3 and battery 4, B-: connect to battery negative end , P+: connection charge / discharge positive, P-: connection charge / discharge negative. Otherwise it will cause damage to the chip.
Do not mix the good battery and poor battery to use.
The internal resistance of 3 battery capacity are closer will be better.

Package inlcuded:
2x 4S lithium Battery Protection Board