5 chirps means that your detector has reached the end of life, based on time. It has nothing to do with the battery. So, you need to replace all of the detectors.
I would remove the batteries, turn off a few breakers, one at a time, and press the test button on the detectors to see if the power is off. Also, the green light should be off. If that doesn't work, and you can replace the detectors with the same type of plug in (not touching the bare wires), I would feel safe doing that. But, it is not the recommended method.
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