Single Usb fast charging Power Bank Circuit. High speed charging Circuit have sngle USB and Type b Charging socket. For indicating battery parcentage it have 4 pcs led where each shows 25% charge of battery. Circuit is very small with switch for checking battery parcentage. You can connect many battery to this power bank. Battery should be 3.7v 18650 lithium ion battery.
Single USB Fast Charging Power Bank Circuit Board
1 x Single USB fast charging Power bank circuit