DC DC converter 5V micro usb to 3.7V Lithium ion battery charger input 5V USB output power supply

Description:

1. Power supply: 5V 1A Micro USB input  or Single lithium battery (18650 battery or 3.7V Standard lithium battery , other battery can't use)

2, If you connect the micro usb in , then connect the battery , it can charge the battery. full charge 4.2V.

3 Output power:  5V 1A USB output, can charge phone , MP3,MP4

4. Size: 50×20 mm.

NOTE:

1. Single lithium battery or USB power supply is suitable,  can use 18650 battery or 3.7V Standard lithium battery, other battery can't use

2. + and - of  battery power supply can't be reversed, power supply voltage can't be more than 6V, otherwise it will damage the IC.