How to Replace the Battery in a Tennis Tutor Ball Machine

The Tennis Tutor is a portable mechanism that feeds balls to users, allowing them to practice moves and improve skills without the need for a second player. You can adjust the trajectory, speed and frequency of the balls fed by the machine. Because the Tennis Tutor requires a 12-volt battery for operation, you may need to replace this part after a period of use.

Things You'll Need

  • Flat-head screwdriver
  • 12V, 9AH replacement batteries
Show More

Instructions

    • 1

      Set the Tennis Tutor on a flat surface. Turn the machine on its side so you can access the battery cover door.

    • 2

      Unscrew each of the screws that hold the panel door onto the side of the Tennis Tutor. Pry this door open with the screwdriver, if necessary. Set the panel aside.

    • 3

      Remove the metal straps obstructing the batteries, using the screwdriver to take out the screws.

    • 4

      Replace each of the batteries with new 12V, 9AH batteries. Install in the exact way the old ones were removed.

    • 5

      Reinstall the parts in reverse order. Turn the Tennis Tutor on to make sure you installed the batteries correctly.