Smoke detector on top floor just had battery changed and is still chirping. Top floor detector is a lot newer than other 2 detectors in home and they should all be the same type in order to work properly. Quote is to remove all 3 detectors and install 3 new combo detectors in there place with 10 year sealed battery. Removed 3 detectors and installed 3 new combo detectors with 10 year sealed battery. Verified proper operation of all completed work with customer.