Please see the following answer regarding the 9 volt battery. To address the non-operating chair itself - generally, there are three main assemblies that make a lift recliner work (aside from the mechanism). They are : the hand wand (hand control), the lift motor assembly, and the transformer (discussed below). If any of these or the wiring that connects them has failed or are damaged, that would stop the lift recliner from functioning. If your chair is stopped either fully up or fully down, your problem is likely the hand control. If the chair stopped functioning one day to the next, the culprit could be the transformer (if you hear no sound AT ALL when you push the hand control button(s). If you hear a faint "click" from underneath the chair when pushing the hand control button(s)and the chair does not move at all, the lift motor assembly may be the problem. These parts are not user-servicable (for most) and would require replacement. The best course of action to begin would be to contact the dealer or manufacturer and describe the circumstances surrounding the failure. That is always how I begin.
26 year reclinerman, October 2011
