Has a battery CR17335 supposed to last 10 years, but in practice is empty after a couple of years.
After this period, you will start to be waked up at night by some random bip, telling you the battery is empty, even is the device is written good for another 8 years.
For sure it is foreseen as a disposable, supposed to be bought again, with a battery which is not replaceable, and device is made hard to open.
Perfect example of waste of energy, material and money.
What you will need:
_ One CR123(A) of 3V (not 3.7V) per faulty detector. About 3€. (Mandatory)
_ One CR123(A) Holder per faulty detector. About 2€ for 5 pieces on Ebay. (recommended)
_ A cutting tool like a Dremel. (recommended)
_ Glue (Hot glue gun recommended)
_ A soldering Iron. (recommended)
_ Some wire, soldering, basic hand tools
_ ~ 1hour.
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Step 1: Opening
Open the smoke detector by prying the 4 tabs with flat screw drivers.
Stay cool. It is annoying but not that bad.
But you will need 4 screwdrivers, and possibly some others hands.
Step 2: Dismantling
Remove battery cover, and motherboard from the housing.
Step 3: Cut the Housing With a Dremel
Cut an opening into the bottom housing.
Adjust the cutting with the help of the Battery Holder.
Step 4: Assembly
In the Priority that you prefer:
_ Glue (hot glue gun recommended for ease) the battery housing. Watch the orientation! Watch the height with the battery!
_ Cut the old battery, and wire the new housing with the motherboard. Watch polarity!
_ Reassemble everything
Step 5: Finalise
Insert battery, connect the tone.
Verify with contact and test button everything works
Verify the height of the battery
Congratulation you saved 20 Euros and you are done for another couple of years.