If the trigger on the Power Massager doesn't engage the motor, or it works intermittently, 9 out of 10 times it indicates a problem with the battery, not the massager itself. Make sure the battery is fully charged and insert it into the Power Massager using the palm of your hand to "bump" it into place. That should resolve the issue.
If the problem persists, snap photos of both the charging end of the battery, the metal clip on the front face of the battery and another of the interior of the charging cradle and email them to email@example.com. Our customer care staff can help with qualifying returns.