Keep in mind that if your smoke detectors are powered primarily on AC with 9V back-up, they are probably wired together. One "beeps" and they all "beep", just not at the same time. If one battery is on the "BEEP", chances are they all will be in the next few days. Replace them all so you only chase them once.
ONly one of mine ata time beeps, one of them started right after I moved in. One more is up so high I don't have a ladder tall enough to reach it. I was thinking about hardwiring a UPS to that circuit anyway, they are on a dedicated circuit.
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