This USB charger pcb is an extremely small module measuring in at only 19mm x 25mm. It uses the TP4056 controller and is setup as default to charge at a 1A charge current. The board runs on any 5 volt power supply, this can be through the usb connector or there are solder pads if you want to use your own connector / adapter. You need to make sure that the 5v supply whether usb or from an adapter is rated at least at a 1000ma output.
Current: 100Ma to 1A adjustable by replacing a resistor
Charge Precision: 1.5%
Input Voltage: 4.5V – 5.5V DC via Micro USB
Full Charge Voltage: 4.2V
Red Led Indicator: Charging
Blue Led Indicator: Fully Charged
Power Input: microUSB.
Operating Temperature: -10C to +85C