Try this one. I use them around. It does pass through power while charging and so far, it works like a charm. Just make sure you pick the right output voltage of 5, 9, or 12vdc outputs. Just use a couple of laptop rescued 18650 cells. Uses the c connector. Only solder on the output lead you need. 5mm barrel male or female, type c, micro, or just plain wires to solder to something to it directly.
It is advertised as a 5v-9v-12v ups battery backup.
Just a thought
Update: Testing results!
Ok, I used a 1 amp USB charger connected with USB c cable to the UPS device.
I used one half charged 18650 rescued from old laptop battery.
I plugged it into the charger (with USB c cable) and plugged it into the Hubitat C-7 (with usb micro cable).
Hub starts fine. I removed the USB c charger cable from the device.
Device does not glitch and the hub remains on and functioning.
(I tried so many battery packs) But they all did the same things.
Problem one:
Most battery packs can not charge while charging.
Problem two:
Packs that can provide power while charging has another problem. With the hub plugged into the device, if you remove the battery charging cable (USB c) the hub reboots because in most battery packs (like most name brand AC ups's) actually pass power through it to power the load and also charges but when the ups loses power there is a glitch in the output power because the USP has to turn on the inverter inside the ups or battery pack.
That is where this device shines! I believe it actually works like this. The device actually powers the load all the time and if the USB c cable has power, it also charges the battery and the output circuits are always on so no glitch & Output power stays steady!
Problem three: almost all the packs I tried, it is hit or miss on if the battery pack can stay on on the output. Yep, the Hubitat hub draws so little power that the battery packs turn off the pack and the hub.
Now, I am using them for everything I can
My wifi mesh routers need 5v @ 3a to connect to the Internet and to pair with the other mesh routers. They just keep flashing on most of my packs and only 2 would power the mesh routers.
So, 5v @ 3a. = 15w
9v @ 1.6a. = 15w
12v @ 1.25a = 15w
As long as your power needs fall within these values, your good to go!
I have some with one cell (3000mah) and I have some with two 3000mah cells.
One pack, I added a 3 piece 18650 holder so now it has 5 cells @ 3000mah.
If I need more or less runtime, I just adjust the amount of 18650 cells. Easy piesy. Oh, and on another device, I glued a 5v and 12v device together for where my Hubitat hub and Mesh router are placed. I added a 2 foot USB c cable on the 12v side and a 2 foot USB micro cable on the 5v device. With this setup, I connected the battery posts together. Now that is four cells to power both devices. This way, you only use one USB c cable to charge the pack with two output powers.
Well, I hope this explains the devices well enough. I looked for something like this for a long time and I felt it was a good device to use.
The only "con" would be that there is no power switch to turn off the power from the batteries down off.
You "can" add switch's to the outputs, but the devices would still run the batteries down.
Seriously though, I have never found a device that works so well. I had a home brewed one. It was a little USB li-ion one cell charger (c or micro). Then hook the battery holder to it. Then a boost board to make 5v or 12v on the output depending on project. For the price, this device seems to fit the bill.
Piece!
