I just purchased the 00754A5 model from Kmart (going out of business, not accepting returns). I placed the sensor outside following the recommendation for placement. I went out to check on it as I waa not getting a reading. The batteries were VERY hot! To the point it burned my hand touching them. Tried other new batteries and the same thing happened. I registered my product for the limited warranty, how can I get it replaced so I can use it?