Just go purchase a large truck or marine battery you cheapskate and rig up a connection from that. 
(Mr. Reolink) @bryonhu or his 
friend can tell you how to do it.
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That’s what I do: house current > Battery Tender > Group 27M deep cycle 12v marine battery > 12v/5v USB adapter > cam(s)
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Hey, thanks fellers, I hear ya, but I’m needing a utility device to do a lot of different stuff as needed, short-term, easily portable and flexible-like. Temporary cam placement in blind spots, crawl spaces, and whatever else occurs is one use I foresee as the whip comes down… 
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well then, forget the marine battery. It weighs ~50 lbs. 
For your use cases, I just use a large capacity power bank. The problem with those cheap “UPS” power banks is that they aren’t true UPS. There are a few microseconds of no power when it switches and that’s all it takes for the cam to reboot resulting in cam requiring WiFi to reauthenticate.
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Ok, I test-um.
/edit
…seems 
I cycled it a couple times and all went well, old v2 chugged along without hiccup.
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Is there anybody in there?
This your theme song.
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That’s a good performance. Have you seen them live, Antonionius? I have not.
Also, is the youngest guy one of their kids?
So, theoretically, starting at home, I could connect a v3 to my little UPS, let it authenticate, with SD card recording continuous, drive to a PFloyd concert, stick the magnet base on a metalhead sitting in the next row down, and bob’s-my-uncle, right? 
Yes I went to a Division Bell Concert at the Oakland Coliseum in 1994 with my wife and 14 year old daughter. It was a super concert. Since I was still in the Navy at the time I was worried about my exposure to all the “second hand” clouds of funny smelling smoke.
They put on a really good show.
The young guy is Richard Wright’s son in law Guy Pratt.
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My biggest regret not seeing them live as they are my favourite band of all times 
Just an update:
Hi, what is the unit’s ‘switchover time’ (in milliseconds) as a UPS? I.e. the interval during which no power is supplied as the unit switches from AC to battery backup when AC power is lost. Thanks!
The switchover time is 0 miniseconds, which means no delay at all.
Thanks, Shanqiu
Connected two cam v2s and two cam v3s to UPS via the 4-port USB hub.
w/UPS fully charged:
Cycled AC power three times, cams unaffected, ran continuously without hiccup
w/UPS 60% discharged:
Same as above, unaffected
/edit
Hey, it came in handy to power-assist a mechanical hard drive in an external enclosure (a 5V 3A plug-in port in lieu of depending solely on the USB power you get with the data connection.) The external HD enclosure did not include a plug-in power supply and cable.