WO-TNFR77775 Customer was having issues with smoke detectors chirping throughout home even after replacing the 9v batteries. After talking to customer we found that the units were almost 10 years old and the older 9v style battery backups. We replaced all 6 units in home with new KIDDE hard wired units with 10 year lithium ion back up batteries. We installed 2 smoke/ carbon monoxide combo detectors in home (1 in foyer and 1 in the basement rec room, and 1 smoke detector in each of the three 1st floor bedrooms as well as one in the unfinished area new the main panel. We also provided a quote for a 240 volt 60 amp charger hook up.