Basically as the title says. We have semi frequent power outages where I live. The noise machine in my daughter’s room goes out and wakes her up. If I were to buy a USB powered one, plug it into a power bank like one of those 10000ma ones you get for charging cell phones, would it have continuous power. Basically like a cheap UPS
Depends if it is able to power while being charged.
None of my battery banks do that.
Most power banks won’t output power and charge at the same time.
There are USB "UPS"s that will do that, though. They’re typically used to run Raspberry Pi projects and are quite a bit pricier than regular power banks.
Maybe something like this?
https://www.amazon.com/ENOFLO-Portable-Charging-Compatible-Smartphones/dp/B0BX8R392P
General UPS are great of medical/server devices too. You can get a generic one and then use software to disable the beep. It’s what they are used for. The batteries are even replaceable.
I was gonna suggest a regular UPS (some have USB ports), but OP said it was for a noise machine/sleeping, so didn’t want to recommend something that would start beeping randomly lol.
Some you can access via the Ethernet and change the settings. Got one of those units and then see if it has the option.
Here’s just one tutorial: https://linux-tips.com/t/disabling-ups-beep-under-linux/592
There are many others. Good in places where medical equipment keeps you alive and sleeping.
Both of my USBc power banks have passthrough charging and would work for this. That’s the feature you need to look for.
However, keeping a battery bank charged to 100% isn’t good for longevity, make sure you get a good name brand one so it doesn’t catch fire.
Edit to add: the ecoflow & jackery power banks can also charge their batteries while running something. They can do 120v/240v and run the current nose machine, but they’re more expensive
Yes, battery banks with at least two ports and pass through charging will handle it like this. The Anker bank I have (Anker 737) does this.
For long term use the battery cells may degrade in capacity and max current after a couple years of sitting at 100% charge, but that’s probably not too big of a deal for you since the noise machine is probably fairly low power.
I don’t think the ones I have would since you have to push the power button to tell it to start charging a plugged in device.
