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Fire & Water - Cleanup & Restoration

How Long Do Smoke Alarm Batteries Last?

2/5/2019 (Permalink)

Fire Damage How Long Do Smoke Alarm Batteries Last? Homeowners should replace the detector unit every 10 years

A smoke alarm will only function if a power source is available. The batteries in alarms that are not hardwired, and the backup battery power in systems that are, should be switched out on a regular basis. It is advisable to be proactive and not to wait for a smoke detector to start beeping before changing the batteries. Find out more about the average operating life of different types of alarm batteries.

Alarms With Replaceable Batteries

Smoke alarms that rely on replaceable batteries may require various types. There are five common types of alkaline batteries:

  • Nine-volt or PP3
  • AAA
  • AA
  • C
  • D

Most smoke detectors with replaceable batteries use nine-volt or PP3 batteries. Make sure that you have spare batteries for any detector. Homeowners should replace the detector unit every 10 years.

Alarms With Non-Replaceable Batteries

Some newer smoke alarm models run on a lithium battery that has a 10-year operating life. Batteries in these detectors cannot be replaced. It will be necessary to purchase and install a new detector at the end of this period. Old detectors should be deactivated according to the instructions for each model prior to proper disposal.

Backup Batteries

Some building codes require homeowners to have hardwired smoke detection systems. A battery backup can ensure that these smoke alarms will continue to function even if the power goes out. These batteries should be replaced at least once a year.

Whether an alarm relies on replaceable alkaline batteries, a non-replaceable lithium battery, or is hardwired with a backup battery pack, it is important to replace batteries at least once a year. If a smoke alarm starts beeping before this time, go ahead and replace the battery. If a fire breaks out and damages or destroys building materials and contents at a residence in Cresson, PA, homeowners should schedule a consultation with a fire damage restoration company.

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