★ MCU users, if you accept a small load KEY can be connected to the microcontroller about 20s to provide a low level allows the module to continue working. Trigger mode: low level trigger (ground) ★ 4 in 1 Charging / Discharging / Lithium Battery Protection / Battery Level Indicator Module. Lithium battery protection function: over-current, overvoltage, over-temperature, short circuit protection ★ In discharge mode (The charging mode KEY function is invalid), trigger the KEY port once to open the output; continuously trigger the KEY port twice to close the output ★ The first time the load is connected, the output is automatically turned on. If the load is less than 50mA, the output will be automatically turned off after 30 seconds; if the load is greater than 50mA, the output will be automatically turned on ★ Allow discharge while charging. (Note: At this time output voltage 4.7 / 5V) Parameter:
Charging voltage: DC 4.5V-5.5V (DC 5V recommended)
Charging current: 0-2.1A
Charging quiescent current: 100uA
Full voltage: 4.2V+ -1%
Discharge current: 0-2.4A
Discharge quiescent current: 50uA
Discharge efficiency: up to 96%
Output voltage: 5V
Output current: 0-2.4A
Ambient temperature: -20℃ to + 85℃
PCB board process: Shen Jin
Size : 25 * 16 * 4mm

The module comes with lithium battery protection function:
Over-current protection (OCP)
Overvoltage protection (OVP)
Short Circuit Protection (SCP)
Over-temperature protection (OTP)
Charge and discharge power level 4 interval indicate

Pin description:
VIN: Charge Port Positive Input +
GND: Charger Negative Input -
BAT: Lithium Battery +
GND: Lithium Battery -
GND: Output Negative Output -
OUT: Output Positive Output +
KEY: Output Enable Trigger Port (Low Pulse Trigger)

Applications:
Car charging retrofit
Driving recorder power supply
Mobile power
Portable devices such as mobile phones and tablets

Package Content:
6 * 2A 5V Lithium battery charging protection module