How can we help you? How long do the batteries last? 0 out of 3 found this helpful With the stair lift, you can expect between 20 and 40 trips between charges which can vary depending upon the length of the stair lift, the angle (steepness) of the track, and the weight size of the rider. Additionally, you can expect your maintenance free batteries to have a lifetime of 1 to 2 years before needing replacement. Was this helpful? Yes (0) No (2) Category: General Related Questions How is the stair lift powered? What if something is in the way or on the track of the stair lift? How does the stair lift attach to the stairs? Can I take the arms off of the stair lift to make the seat wider?