Your annual smoke alarm service covers a lot more than just replacing the battery and pushing the button.
If you are on the annual smoke alarm service with either Tassam or Detector inspector they will;
The Residential Tenancy Act states that the alarms in rental properties must be checked within 30 days of a new tenancy.
That check when conducted by a qualified and insured company is only guaranteed for 12 months from the date it was done. Should there be a fire after the compliance period the liability would fall onto the owner and your insurance would not cover this.
Yes the smoke alarms have a 10 year battery life however there is no way for us to tell if the alarm ceases to work for any reason other than an annual check. The manufactures gives a ten year life on the alarm however alarms are not failure proof.