Desmond will replace your smoke detector batteries for you when he cleans the dryer duct, I am not sure if he charges extra for that.
Depending upon the age of your smoke detectors if they are over 10yrs old then it would be time to replace them. We replaced ours in May and bought the newer model which has 10yr lithium batteries in them hence in 10yrs we replace the whole unit but no more changing batteries every year.
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