Kidde/FireX i4618AC Battery Replacement

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Introduction

If your Kidde/FireX i4618AC smoke alarm is chirping once every 30–60 seconds, or if it has been six months since the last battery change, it is time to replace the 9‑volt battery.

A working smoke alarm is essential for early fire detection. Most alarms chirp regularly when the battery is low, signaling that a replacement is needed. Even if the alarm isn’t chirping, replacing the battery every six months helps ensure reliable operation.

Before beginning, make sure you have a 9‑volt alkaline battery (Duracell, Energizer, or equivalent) on hand. This guide shows how to replace the battery in a Kidde/FireX i4618AC, though similar steps apply to many other front‑loading Kidde models.

This repair will likely require climbing a ladder or using a step stool to reach the smoke detector. Be very careful when working on a ladder or stool to avoid falls.

What you need

Step 1 Battery

Kidde/FireX i4618AC Battery Replacement, Battery: step 1, image 1 of 2

Kidde/FireX i4618AC Battery Replacement, Battery: step 1, image 2 of 2

Place a step stool or chair directly under the smoke alarm to safely reach the unit.
Make sure the chair or stool is stable before climbing.

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Step 2

Slide the battery cover on the front side of the unit outward until it is fully open.

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Step 3

Remove the old 9‑volt battery from the compartment and set it aside for proper disposal.
Follow local guidelines when disposing of used batteries.

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Step 4

Insert a new 9‑volt alkaline battery into the drawer.
Make sure the positive and negative terminals match the markings inside the compartment before sliding it in.
Only use alkaline 9‑volt batteries for this model.