My Pride Mobility Jazzy Passport power chair will not turn on or will not charge

The Jazzy Passport with its lithium ion battery pack may not come charged enough out of the box to operate the chair. It must be charged before using. For safety reasons, the battery pack has an on-off switch right on the battery pack. The switch is labeled with an "I" and a "O".  The switch must be in the "I" position for charging and in order for the chair to operate. It is moved to the "O" position when you're transporting the chair to ensure the chair is not accidentally turned on. It is also moved to the "O" position for safety purposes when travelling on airplanes, etc.