Kidde 4010 Series Teardown Battery Replacement 10 Year Worry Free Wireless Alarms Repair Guide

Difficulty

Moderate

Steps

Time Required

                          10 - 30 minutes

Sections

Battery
4 steps

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BackKidde 4010 Series Wireless Smoke and CO Alarms
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Introduction

I’ve had several of these alarms start giving a low battery chirp after months, not the full ten years. Kidde has been good about sending replacements under the 10 year warranty, but I thought maybe I can keep these units out of the landfill….

Models P4010ACS-W P4010ACSCO-W P4010DCS-W P4010ACSCO-W P4010LACS-W P4010LDCS-W.

What you need

Step 1

              Disassembly

First, figure out a screw management scheme. This one’s not so complicated, but it’s a good habit.
Rotate the power switch to the unmarked “off” position. Don’t worry, this is safe.
Remove three tri-wing screws.

First, figure out a screw management scheme. This one’s not so complicated, but it’s a good habit.

Rotate the power switch to the unmarked “off” position. Don’t worry, this is safe.

Remove three tri-wing screws.

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Step 2

              Disassemble

Remove bottom cover and set aside the red power switch.
Open the inner case, using a flat blade screwdriver to open three plastic latches. Expose the circuit board and batteries.
Measure and record the old battery voltages, with the power switch firmly OFF. A new battery is about 3.3 volts, the bad ones seem to be about 2.8 volts.

Remove bottom cover and set aside the red power switch.

Open the inner case, using a flat blade screwdriver to open three plastic latches. Expose the circuit board and batteries.

Measure and record the old battery voltages, with the power switch firmly OFF. A new battery is about 3.3 volts, the bad ones seem to be about 2.8 volts.

Step 3

              Replace Batteries

Hopefully you’ve already obtained replacement batteries. Anything with a tab can be made to work. Here it’s a 2/3A size battery with PC board pins. Not an exact match, but close enough.
To cut the old battery out: use strong side cutters and a back and forth motion. Leave enough of the tab you can solder to it later.
To remove using a hot/powerful iron: take out three more screws to remove the circuit board. Heat up each tab in turn and pull up on the battery. Leave as much solder as possible in the hole for later.
Double check the power switch is off, and the polarity. Finally, solder the new battery in.

Hopefully you’ve already obtained replacement batteries. Anything with a tab can be made to work. Here it’s a 2/3A size battery with PC board pins. Not an exact match, but close enough.

To cut the old battery out: use strong side cutters and a back and forth motion. Leave enough of the tab you can solder to it later.

To remove using a hot/powerful iron: take out three more screws to remove the circuit board. Heat up each tab in turn and pull up on the battery. Leave as much solder as possible in the hole for later.

Double check the power switch is off, and the polarity. Finally, solder the new battery in.

Step 4

              Wrapping up

Double check the polarity of the batteries! If you get it wrong, the battery will probably catch fire.
Flip the power switch to the middle “ON” position. Be careful, the third position is “drain battery and discard unit”.
Hold the center button until you hear one… two… three beeps. Release, and your unit will be reset to defaults.
Flip that power switch back off for safety.
Yikes, it sure makes a forlorn sound when you flip the power off, eh? Reassemble. The only tricky part is the switch, but there’s a little arrow to help you get it lined up.
Properly dispose of the battery. That means, not in the trash. Google it. Or see https://greencitizen.com/lithium-ion-bat… or in the USA https://www.call2recycle.org/

Double check the polarity of the batteries! If you get it wrong, the battery will probably catch fire.

Flip the power switch to the middle “ON” position. Be careful, the third position is “drain battery and discard unit”.

Hold the center button until you hear one… two… three beeps. Release, and your unit will be reset to defaults.

Flip that power switch back off for safety.

Yikes, it sure makes a forlorn sound when you flip the power off, eh? Reassemble. The only tricky part is the switch, but there’s a little arrow to help you get it lined up.

Properly dispose of the battery. That means, not in the trash. Google it. Or see https://greencitizen.com/lithium-ion-bat… or in the USA https://www.call2recycle.org/

You saved an expensive detector from the landfill. Yay!

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                    Bryce Nesbitt

Member since: 11/30/2014

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Member-Contributed Guide

Introduction

What you need