How do I charge and connect my USB-A battery?

Your USB-A Battery has three ports. The one by itself at the rear of the battery is the USB port used to connect accessories. In the front there are two ports, the first one, closer to the LED lights, is where you should connect the battery's power cable to charge it, and the other you will use to connect the battery to your M-Series Smart Glasses. You can see your battery ports in this image.