My house was built in 2004.
In 2015, I decided it was time to change all the detectors. I replaced the one carbon monoxide detector with a BRK CO5120BN. I replaced six of the smoke detectors with BRK 9120B (Ionization smoke sensing) devices. The smoke detector in the bedroom was replaced with a BRK 7010B (Photoelectric smoke sensing).
In 2016, I replaced all the 9 volt batteries with 10-year lithium batteries. Hopefully, the house is good through 2025, batteries and all.
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