To recharge your Swingbyte battery, use the USB cable that came in the package-- just plug that into your computer or any USB charger. The green light on the front of your Swingbyte will illuminate when it's plugged in to charge, that will turn off when your Swingbyte 2 is fully charged.
Once your battery is fully charged your Swingbyte will work for approximately 4 hours of continuous capture.
For Swingbyte 2: the USB port on your Swingbyte 2 is at the top of the hardware, under the white alignment guide.
For Swingbyte 1: The USB port on your Swingbyte 1 is on the right side of your Swingbyte hardware.