4 in 1 charge/Discharger(boost)/battery protection/Battery level indicator modules DD06CVSA is a multifunctional 3.7V/4.2V Mobile Power Diy module,3 in 1 Function: charge,discharge and battery protection. It is very suitable for DIY mobile power. Charge voltage: DC 4.5V-5.2V (If the power supply is 5.2V-5.5V, please parallel diodes (eg SS34 SMB)) Charging current: 0-2.1A; Charge quiescent current: 100uA; Full charge voltage: 4.2V+-1%.; Discharge current: 0-3.5A;; Discharge quiescent current: 50uA; Discharge conversion efficiency: maximum 96%; Output voltage: 5V; Output current: 0-2.1A; Operating ambient temperature: -20 to +85 Comes with battery protection, do not need battery protection board (if your battery comes with a protective board, it does not matter) Overcurrent protection(OCP) Overvoltage protection(OVP) Short circuit protection(SCP) Over temperature protection(OTP) Pin description: 1 VIN : Charging port + 2 GND : Charging port - 3 BAT : Battery port + 4 GND : Battery port - 5 GND : Output port - 6 VOUT: Output port + 7 KEY : Output trigger port(Low pulse trigger) 1. In discharge mode(In the charging mode,the KEY function is invalid), the KEY Trigger once,turn on the output;Continuous trigger twice: turn off the output. 2. When the load access, it will automatically turn on the output. But if the load is less than 50MA, the output will be turned off after NOTE: If the output load current is less than 50MA, turn off the output after . If the output load current is 50MA,continuous turn on the output This module is not suitable for uninterruptible power supply(ups),If you need the UPS module, Click here to buy colour: green Material: PCB Size: 35x15mm Package Contents: 3 x Charge discharge module Only the above package content, other products are not included. Note: Light 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.