External Battery Pack

● Provides an additional 4-6 hours of battery power for all Tennis Tutor Models and Wilson Portable
● Includes a nylon carrying case that houses the battery and a built-in Smart/Fast Battery Charger

NOTE: The External Battery Pack should always be plugged into the machine at the beginning of play when both the internal and external batteries are fully charged. If you connect the External Battery Pack after the internal battery has been exhausted, you could damage the electronics. The External Battery Pack comes with it’s own smart charger installed so it should be plugged in continuously to AC power when not in use. If you have the External AC Power Supply, it is also better if you connect it at the beginning of play.