To charge a Kindle device, use the USB cable that came with the device to connect it to a USB port on a computer. Charging the device this way typically takes between four and six hours, depending on the USB port and the computer hardware.
Alternatively, use a power adapter that's compatible with the USB cable to connect the Kindle device to a power outlet. The advantage of using a power adapter is that the charging process takes less than four hours, but the adapter must be bought separately. While the Kindle device is charging, a battery icon appears on the screen, and the indicator light on the device turns amber. When the light turns green, the Kindle device is fully charged.