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Avoid the 2AM chirp ✚ Insured for your safety ✚ Thornton, Colorado ✚ Serving North Metro Denver ✚ Parts & labor included ✚ Avoid the 2AM chirp ✚ Insured for your safety ✚ Thornton, Colorado ✚ Serving North Metro Denver ✚ Parts & labor included ✚ 
✚ Detector Inspectors LLC
Home/Guides/Sealed vs Replaceable Smoke Alarm Batteries

Choose the maintenance pattern

Sealed vs Replaceable Smoke Alarm Batteries

The backup-battery design changes routine maintenance, but it does not change the need for monthly testing or end-of-life replacement.

Call (303) 880-9881 See flat pricing

Replaceable batteries

Traditional battery-powered and hardwired alarms may use replaceable batteries. Follow the model instructions, respond to low-battery chirps promptly and test after every battery change.

Sealed ten-year backup

A sealed backup is designed to remain with the alarm through its service life. It is not opened for yearly battery changes; when the sealed battery or alarm reaches end of life, the whole unit is replaced.

Hardwired is a separate question

“Hardwired” describes the primary power and interconnect arrangement. A hardwired alarm can have either a replaceable or sealed backup battery.

Detector Inspectors’ replacement models

The First Alert SM105-AC smoke alarm and SMICO105-AC smoke-and-CO alarm used in the published replacement services are hardwired models with sealed 10-year backups.

Safety references

Primary sources used for this page:

Manufacturer instructions and current local requirements control. For an emergency, call 911.

North Metro Denver

Handle every detector in one visit.

Call or text Jayson to schedule residential smoke and CO detector service.

Call (303) 880-9881 jaysonsale@icloud.com

For an active alarm or suspected emergency, get outside and call 911.

Next steps

First Alert SM105-AC Replacement Service Learn about the First Alert SM105-AC hardwired smoke alarm used in Detector Inspectors’ $65 replacement service.First Alert SMICO105-AC Combo Alarm Service Learn about the hardwired First Alert SMICO105-AC used in Detector Inspectors’ $85 smoke-and-CO combo replacement service.Smoke Detector Battery Replacement Service Avoid the ladder and the late-night chirp with residential smoke and CO detector battery replacement in the North Metro Denver area.

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