My smoke alarms have started bleeping intermittently.
when prodded for testing the alarm goes off. Does this mean they are not functioning properly or that the battery is low. If I remember correctly the battery cannot be replaced and the whole unit needs replacement. They have been in place approx. 6 years.
You may well have a rechargeable lithium battery that has come to the end of its life. You may have to replace the whole thing.
What's the make and model?