SKE Compact Size 425VA/240W UPS Battery Backup & Surge Protector for Computer UPS Uninterruptible Power Supply UPS Phoenix VL425

Got this late April 2025 to keep our Nokia fiber ONT (XS-250WX-A) running for a bit in case of an outage. The modem doesn’t flinch when I pull the UPS plug out of its outlet, and for the two hours that I had it unplugged the fiber modem kept working just fine. It might last quite a bit longer, but 2h is already great for our use case.The big unknown for us is battery longevity in a hot garage. I’ll update the review when the battery degrades to the point of becoming unusable. It’s the same chemistry as car batteries though, which last 3+ years in the Florida heat, so I’m hoping this unit will continue to work for at least that long.

I bought this smaller UPS to keep my Fiber ONT running when there's an outage or a power blip (the rest of my network - APs, Switch, Gateway etc) is already on a rack-mounted UPS so this ONT was my 'single point of failure' when we lose power for a while.It's a well made, smaller UPS. It's quite basic, with a power button for turning it on and off, some simple LED indicators to show power or battery mode, and an alarm for when the power is out. It wasn't super obvious to me that the battery-protected ports were the black 'normal' looking plug sockets and not the white ones. At first I had the ONT plugged into the wrong sockets and wasn't sure why it didn't work. (The white ones are surge only, no battery backup)It's powered by a single 5Ah battery. It transitions to battery mode on the loss of power instantly, there's not interruption at all for the device(s) being powered, and I figure based on some rough math that it might keep my low power ONT running for 45 minutes or so. I will test that completely at some point.The instructions state that you have to fully charge the battery before first use, so I left it plugged in overnight before I used it.I'm impressed. It's a low cost, basic UPS that should work perfectly for a use case like this. Given the small battery I wouldn't think it will keep much running for very long, and it's rated for lower than most desktop PCs will consume when they're working hard... So modems, routers, ONT units, maybe a switch or two... but don't expect to protect much more than that.Once I've tested how long this keeps my ONT running for I'll update my review. I also might try to find a 12V 7Ah battery that fits this unit... again, based on my calculations that would increase the time it'll keep devices on by about 40%... but I intend to experiment and find out!Impressive little unit! Perfect for something like this!

Follow all the directions - read the entire user pamphlet-- it works once then stops working. Had tech-savvy SIL take a look at it and he got the same results. Ergo, my recommendation is buy only if you feel the odds will be with you and yours will work.

Power stayed on our devices when the power went out!!

Looks to be a super unit, no problems so far.

So far, so good, but lost one full Star over the User's Guide. Diagram of the functions would require a magnifying glass to read. Written instructions are very basic. DID NOT MENTION TO HOLD THE 'ON BUTTON' DOWN for several seconds to turn on. I thought it was DOA until I gave it another last try!

Works great to save electronics during power surge

Very cool and modern unit. Used for backing up tankless water heater and I works well