The Lamp Room

The local village hall has three mains powered fire alarms, each has a capacitor back-up. (One heat in the kitchen and two smoke in the main hall). All of them have wireless bases to interlink them. Anyway the two in the main hall started chirping. Two new alarms were bought and fitted today and they still bleeped. Turns out the 10year lithium batteries in the wirless interlink base units have expired after 5 years and just out of the warranty period and the detectors themselves were still good. Got to do something as we have a group staying overnight this weekend.
Not the first time I've know 'long life' lithium cells in fire alarms fail early. Anybody else had this problem?

There's a surprise. Not by any chance made by Kidde Fyrenetics are they?

No these are BRK, no idea if they're related but there appears to be atreand of them misbehving looking at google
Some Fire Angle battery powered ones did the same at my grandma's a few years back, after 13 months, just in that instance one decided to start false alarming at 3am.

I've always found this is a problem with Kidde Fyrenetics stuff. Alarm has a '10-yr non-replaceable' lithium re-chargeable cell in it and it fails at about 30 months. Their response when I called to complain... ...well, it only has a 1yr warranty. Since then I've always gone with EI Professional (Aico) alarms and I've installed hundreds of these and never had a problem. Cost a bit more, but you get what you pay for I guess.....

Alarm talk here guys I know quite a lot about them as I collect them yeah Aico are great detectors in my house I use Apollo

At home we aren't to fused just as long as you can change the batteries. Just today I got a full new set for the whole house.