Smoke & CO2 Detector Rechargable Batteries?

My Smoke & CO2 Detectors are not connected to an alarm system and I am tired of changing batteries. Since the alarms have A/C, couldn't the A/C be continually charging a backup battery in the detector? I have looked without success - where do I find Smoke/CO2 Detectors with rechargable battery backups?

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DavidB
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