For a fire/CO2 detector that has several "the battery is not replaceable" stickers on it, this thing sure looks like I could replace the battery.
It's a 3v lithium. The brown thing is a CO electrochemical cell.
@smellsofbikes yeaaaaah but you honestly kinda don't want to
the 10 year lifespan of smoke detectors is more about electronics reliability over time than anything else
(and I've actually had them fail out - rarely within 10 years, but sometimes broadly in 15. if you want to be the kind of person who actually does check monthly, then sure, you can stretch 'em out, but don't blame me when they wake you up at 3am... repeatedly. xD)
@moira@smellsofbikes They should explain that on the sticker instead of pretending the battery can’t be replaced. I’d have the exact same thought of “bullshit. The battery can 100% be replaced” as it can it most any device.
What’s the CO cell for? Doesn’t help with detection somehow?
@moira@mroach This is a combo fire alarm and carbon monoxide detector. The detector is a Figaro. Datasheet: https://static.rapidonline.com/pdf/1273389_da_en_01.pdf
With one op amp and a feedback resistor this looks like it's a cute little portable detector in the making and I'm gonna make one at work today. It looks like it'll see any hydrocarbon, although it's optimized for CO.
@SaguaroLynx@smellsofbikes@mroach Maybe. But it really depends upon what usually dies and I genuinely don't know which is which. I admit I've wondered that myself - electrolytic capacitors are usually the first bet but that's hardly the same as knowledge - I really have no actual idea.
@SaguaroLynx@moira@mroach Yeah, the electrochemical cell was pretty trivial to remove. It's not even soldered in. They don't list a lifetime on it in the datasheet, either, so I suspect the 10 year lifetime may be either MTBF on other electronics or that's how long it takes to gunk up the optics on the fire/smoke/particulate detector.
@smellsofbikes@SaguaroLynx@mroach I'm pretty sure 10 years is less than MTBF, but is more approximately some number where projected reliability across all components becomes low enough that insurance companies start to care because their actuary tables start to care.
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