If your scanner isn't functioning properly, the problem might be with the battery of the device. Diminishing barcode scanner batteries are one of the leading causes of portable scanner failure. A few simple steps can be taken to determine if the issue lies with your scanner battery:
First, inspect the cradle to verify it's powering on correctly.
If the cradle appears to have power, remove the scanner battery and reset it to ensure the terminals are connecting properly.
If the device still fails to power on, consider replacing your barcode scanner battery.