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Changed battery on key fob after getting warning from instrument cluster. After changing battery its not working. red light isnt flashing when i push a button. put the old battery back in and still not working. Is there a relearn procedure? positive side up and negative side down. Dont want to get a new one and have dealer gouge me with a reprogram.
 

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2018 Hyundai Elantra Sport DCT w/TECH
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Measure the voltage of the new battery with a multimeter. The new battery may be "new old stock" and below minimum voltage. Battery replacement does not require relearn procedure.
 
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