Plain and Simple – No One! If you should come across an advertisement or have a sales representative claim to have a stair lift with a “battery back-up” you can scratch them off your list of Honest Dealers and look elsewhere. In the recent past, several stair lift companies used printed advertising (both in magazine ads and internet ads) until they were threatened with a law suit for false advertising. Still today, the representatives of those companies will verbally talk about the “battery back-up” in their presentations and sales pitches. This is a major RED FLAG and you should avoid these dealers entirely. If they are attempting to deceive you from the start … what do you think happens when you need service or have warranty issues.