Battery stair lifts will operate even if the power in your home goes out. However, the batteries will need to be replaced about every 2 years. Battery stair lifts plug into outlets just like electric stair lifts, but the outlet actually charges a battery which then runs the motor. If power goes out, the battery will run the stair lift and you won't have to worry about becoming stranded. Time to replace your stair lift batteries? We carry stair lift batteries.