[Greg T.]

I’m considering the CarbonOne Safe for my place, but I’m a bit confused about the battery backup. If the power goes out, does the unit keep detecting gas and smoke for a while, or is the battery only for keeping the alarm going briefly? Also, I assume the display goes off on battery, right? Just wondering if it’s still useful during an outage or if I’d need to rely on something else.

[Paul Graves]

I had the same question before grabbing one. For me, the important thing is that it keeps detecting during an outage, and mine does. I had a storm knock the power out for a few hours last month and the screen did go dark, but the unit stayed on and I could hear it do its little self-check beep when I walked past. It was still working, just not showing me the numbers.

I mainly wanted it for the kitchen anyway, as a second layer of warning if something happened while we slept. The backup battery gives me that peace of mind without needing to run around checking a separate detector. It’s not a full smart system or anything, but for a simple plug-in device it does what it says. I wouldn’t expect it to run for days, but for a typical outage it’s been fine for me.

[Mike Runner]

The backup keeps the sensors running, not just the alarm, but nobody here can tell you exactly how long it lasts.

[Jade Writes]

I guess it depends on what you mean by useful. For me, the main thing is peace of mind that it’s still watching for a leak while the power’s out. I wouldn’t expect to be staring at the display anyway during an outage, just nice to know the alarm will sound if something happens. Long enough for your typical outage is probably fine.

[Emma Mirren]

I actually had a power outage about a month ago that lasted a few hours, and I remember thinking the same thing when I first got mine. The display does go dark, that part is true. But I noticed the little status light kept blinking, so I knew it was still doing its thing. I didn’t sit there and time it, but it was still running when the power came back on, which was around four hours later I think.

What I found more useful during that outage was actually having a separate battery powered CO alarm in the bedroom. Not because I don’t trust the CarbonOne, but just because I didn’t want to have to walk over to it in the dark to check if it was still alive. The blinking light is fine, but it’s not exactly easy to see from across the room.

For me, the backup is more about peace of mind than constant information. I don’t need to know the exact ppm reading while the power is out. I just need to know that if something bad happens, it will make noise. And from what I can tell, that’s what it does. I did test the alarm function once while it was on battery just to hear it, and it was plenty loud.

I would say don’t expect it to be a full monitoring station during an outage. It’s more like a safety net. If you’re someone who wants to keep an eye on readings during a storm or whatever, you might want a second device with its own display. But for basic detection and warning, it seems to hold up fine for typical outages.

[Tina Bell]

I would not want one that just beeps for a few minutes and then goes quiet. For me the whole point of a backup is keeping the sensors alive so I know if something is building up while the power is off. The display going dark is fine as long as the detection part keeps working. That is the part that actually matters to me.

[PixelKevin]

The battery keeps the sensors running, not just the alarm. But I would not assume the screen stays on the whole time. I noticed mine dims the display pretty fast on battery to save power, which makes sense. So it is still watching, you just cannot glance at it as easily during an outage.

[Mike Jensen]

The display does shut off to save battery, so you are not getting live readings during an outage. But the sensors are still active, which is the part that matters. I would not count the screen staying on, just the detection and alarm being there if something happens.

[Cora Finch]

The battery is mainly there so it keeps monitoring while the power is out, which is the part that matters most to me. The screen goes dark to save power, so you won’t see numbers, but if something goes wrong, it will still sound off. I would not want a detector that just dies with the lights.

[Kate 87]

The backup is mostly about keeping the sensors alive during an outage, not just the beeping. The screen definitely goes dark to save power, so you won’t see live numbers, but it’s still checking the air in the background. I think that’s the part that matters most if you’re worried about a leak while you’re asleep. It just means you wont get a visual heads up, only the alarm if something actually goes off.

[Luis_A91]

Battery backup in these plug in detectors is usually a trade off. If the screen stayed on the whole time it would drain way too fast, so I would expect it to go dark pretty quickly. The way I look at it, the important part is that the sensors stay active and it can still sound an alarm if something goes wrong while the power is out. You don’t really need live numbers on a screen during an outage. What matters is whether it will wake you up or warn you.

For a few hours, I think you are fine relying on it. If you are talking about days without power, that is a different story and probably not what this kind of device is meant for. I would say treat it as a safety net for short outages and maybe keep a separate battery powered detector around if you want extra peace of mind. But for the usual storm related outages, it should do its job.

[Alex Morgan]

The way I look at it, the backup battery is for the sensors, not for you. Once the power goes out, that screen is going dark to save every bit of juice for the actual detecting part. You’re not going to be standing there watching the numbers tick up or down in the dark. That’s just not what it’s for.

For me, that trade-off is fine. If the power is out and something is leaking, I don’t need to see the reading on a screen. I need the thing to yell at me so I can get out or shut off the gas. The alarm is the part that matters in that situation. I’d rather have it beeping for as long as possible than have a pretty display that kills the battery in an hour.

I will say, it does feel a bit weird not knowing what’s going on if the power is out for a long time. You kinda just have to trust that it’s still working back there in the dark. But honestly, that’s what I bought it for. I wanted something that would keep an eye on things when the house is quiet and dark, not something that would entertain me with readings.

I don’t know the exact hours it’ll last on battery, and I hope I never have to find out the hard way. But the way I see it, a few hours of protection is better than nothing at all if the power goes out while you’re sleeping.

[Tara Grace]

If the power’s out long enough that I’m actually paying attention to the detector, I figure I’ve got bigger things to worry about than watching numbers on a screen anyway. I just want it to do its job quietly in the background and not die on me. I’d rather have it save the battery for monitoring than waste it lighting up a display I’m not staring at.

[EnderWizard]

For me the battery is what makes it worth buying. I had a storm knock out power for almost a full day and the unit kept doing its thing the whole time, even though the screen went dark after a bit. That’s really all I need from it.

[AnnaK]

I’ve had mine through a couple of shorter outages and the sensors definitely kept working, which is the main thing. The screen does go dark pretty much right away though, so you’re not getting any live readings during that time. For me, that’s fine since the alarm is what matters if something actually goes wrong.

[Eddie___K]

The battery backup isn’t just for the alarm noise, it keeps the sensors running. I had mine through a couple of outages and the unit kept monitoring the whole time. The screen does cut off pretty much right away, so you won’t be seeing any numbers, but that’s fine with me.

The way I see it, if the power’s out, I’m not sitting there staring at a CO reading anyway. What matters is whether the thing will still scream at me if there’s a problem while the electricity is down. Mine did what it was supposed to do. I think it lasted through a solid six or seven hour outage without any issue and never gave me a low battery warning afterward.

I wouldn’t expect it to run for days on end, but for the usual blackout where you’re just waiting for the power to come back, it does the job.

[Mike in NYC]

The battery keeps the sensors running, not just the alarm. That’s really the part that matters during an outage. I had mine through a few blackouts and the display goes dark pretty much immediately, but the unit is still actively monitoring in the background. If something actually triggers, the alarm will still sound even though the screen is off.

I think some people expect it to work like a UPS for the display, but that’s not really the point. You don’t need to see the readings while the power is out, you just need to know if there’s a problem. As long as it’s still detecting and can alert you, that’s the useful part.

The only thing I’d keep in mind is that the battery has a limit. It’s not meant to run for days on end, just to cover the gap until power comes back. For typical outages that’s fine. If you’re somewhere that loses power for long stretches regularly, you might want a separate backup plan anyway.

[Jake Holloway]

The backup battery keeps the sensors alive, that part is right. But mine died after maybe 18 months and just started beeping at me until I swapped in a fresh 9V. So dont assume it will ride through every outage forever. The screen cuts off fast on battery, so check the battery status once in a while when the power is on.

[Tom_Craig]

The outage duration is the real question. If it’s just a few hours, fine. But if you’re expecting it to run for days like some kind of mini UPS, that’s not what this is. It’s for giving you enough time to know something is wrong, not for keeping you informed all night long.

[Linda Robinson]

If you’re worried about an outage lasting days, I’d just grab a plug-in unit with a 9V battery as a backup for that situation. The CarbonOne is fine for short blips, but I wouldn’t treat it like a survival tool. It’s more about keeping the peace of mind for the first few hours, not a week without power.

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