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With my smoke detectors, it may initially be 10-15 minutes between "chirps" indicating a low battery. It can be a nuisance waiting for the next chirp to tell which detector it is; so, I twist them off their base mountings as I would to change the battery and I put them all next to me for awhile, some to my left and others to my right until one of them chirps again. If it continues to do the same with a fresh battery, the life of the unit's sensor is probably up and the detector needs to be replaced. Battery backup units beep intermittently when the electricity is out; but, some will also beep when their rechargeable battery is no longer holding a sufficient charge and needs to be replaced. If you have something like an APC battery backup for your cable modem and Wi-Fi router and those are in another part of the house, you might check that too.
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