How do I replace the battery in my remote?

Use a Phillips #1 screwdriver to unscrew the captive screw on the back until it rotates freely, then pry open the housing from the bottom. Push out the old battery with a cotton swab, insert the new CR2032 battery positive side up, and reassemble the housing by aligning and tightening the screw until secure.

From the official Craftsman Garage Door Remote 139.53753 manual, page 4

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