I replaced the battery in one of my fobs and didn't have to go through any reset procedure - just changed the battery and it worked.
Check and make sure the battery is installed correctly, positive-to-positive/negative-to-negative.
Look for any corrosion or other material on the contacts - gently clean with a rubber pencil eraser if needed. Clean the battery - buffing with some denim usually works or use the eraser.
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