A stair lift raises a person up and down alongside of a staircase safely without any physical effort of her own. Those with disabilities who use stair lifts in their homes find new freedom without depending on the help of others. The stair lift controls operate electrically from the seated position and are energized by two batteries that are linked together for added power. You can install new batteries in a stair lift device with a few tools and basic electrical maintenance experience.

Step 1

Remove the hinge cover screw using the appropriate screwdriver. The screw is located at the stair lift footrest. Turn the screw counterclockwise and remove the cover.

Step 2

Remove the four cover screws and cover from around the seat post using the screwdriver.

Step 3

Cut the plastic cable tie that surrounds the seat post boot using wire cutting pliers. Open the boot at its seam and remove it from the base of the post.

Step 4

Remove the two battery carriage cover screws and cover to expose the batteries. The screws are located at the lower front edge of the carriage. Turn the screws counterclockwise with the screwdriver to remove.

Step 5

Remove the negative (-) plug-in connector from the battery by pulling it straight out from its terminal.

Step 6

Remove the positive (+) plug connector from its terminal.

Step 7

Remove the two wire link plug-ins that connect the two batteries together.

Step 8

Cut the plastic tie which binds the two batteries using the wire cutting pliers.

Step 9

Remove the retaining screws from each of the metal battery straps with a screwdriver. The strap screws are located at the top of the batteries. Make sure the metal straps do not come in contact with the battery posts.

Step 10

Remove the batteries from the battery carriage.

Step 11

Install the new batteries and place a new plastic tie strap around the batteries. Pull the tie strap tight using combination pliers. Cut the excess off with the wire cutting pliers.

Step 12

Connect the metal battery straps together with the retaining screws. Tighten the strap screws clockwise with the screwdriver.

Step 13

Connect the link cable to the new battery link posts.

Step 14

Plug the positive (+) connector into the positive terminal on the battery until it is fully seated.

Step 15

Plug the negative (-) connector into its terminal.

Step 16

Install the battery carriage cover onto the chassis and tighten the cover screws clockwise with the screwdriver.

Step 17

Replace the seat post cover and tighten its four screws clockwise with the screwdriver.

Step 18

Install the seat post boot and secure it with a new plastic tie strap. Pull the strap tight with the combination pliers and cut the excess off with the wire cutters.