I wonder if the beeping is a warning that the main gel-cell battery powering the motor is on its way out. Anyone know? The gel-cell is a bit of a pain to get at, otherwise I'd just test it with my multi-meter rather than posting this question. The gel-cell bettery has not been changed for about ten years, I believe. It is supposed to keep itself charged up from the mains while the stairlift's chair is stationary.