Carbon Monoxide Alarm XC70 renewing the battery?

[ericmark]

There has been now for 6 months a bleeping in my flat, which at first I thought was the smoke alarm, but after hunting today my daughter found it was a Carbon Monoxide Alarm XC70 since no one lives in the flat, not really a problem, but it would be good to fix it for the odd time someone says, clearly not designed to have the battery changed, but I am unlikely to buy a new one, so swapping the battery would be a good idea, I assume put in the flat due to the oil fired boiler fitted, and now back has been removed, the beeping has stopped, I think Wales&West Utilities are a gas firm, so would assume it was not issued for use in this house, so maybe not required anyway. So any ideas if battery can be renewed?

 

[Alec_t]

Is that rectangular section on the back removable?

 

[flameport]

Those things are not intended to have the battery replaced.
The CO sensor has a limited life, which is why that one and others like it have an expiry date on the back.

 

[333rocky333]

I was called out to one of them bleeping, unclipping from base does turn unit off.
I had a look inside it and im sure there was a battery, , so long ago I forgot what it was, but in the end just binned it