CyberPower SL700U Standby UPS Battery Backup and Surge Protector

Perfect for my custom-built SFF PC setup. This 700VA slim version sits on my desk, so no more tangled cords near the floor, and is nearly completely hidden by my small case. Still haven't used all the outlets. Price is excellent. This brand was recommended by the shop that built my PC, they use several versions of it. Just an hour after it was all connected we had a power flicker and I just heard a soft click but there was no interruption. Highly recommend!!

Follow up to an earlier review around a year ago:I have two of these. One unit failed at a year and a half - the battery was fine but the control unit failed. Disappointing, definitely but out of warranty they replaced it so I renew my statement of excellent customer service. Though I do think a product like this that, like a flashlight sits for long periods of time before being needed should have a warranty longer than a year.The other unit at about a year continues to perform without issue. Original review ...Some reviewers "hate" the beep while they apparently just live with it. Here's what to do (sometimes reading instructions can really help): double click the power button with the unit already on AND plugged in, wait for a double beep and the beep is silenced. Reverse to turn it back on.If this is backing up security equipment naturally you don't want to alert intruders to this box.My experience: the thing works, the slim case offers more location options and the tech support is excellent.

I'm using this in my home entertainment center. I had tiny power blips that caused the TV to restart and that got annoying. This fit nicely in the back of my TV stand, and provides plenty of power for all my components.

The CyberPower SL700U is the kind of UPS you keep around not because it’s a powerhouse, but because it’s a polite, dependable little buffer that smooths out life’s electrical hiccups. It’s slim, unobtrusive, and perfect for the gear that really just needs clean, uninterrupted power long enough to avoid a reboot—modems, routers, ONTs, or those tiny-but-critical devices that absolutely should not experience a brownout. As a surge protector plus brief-runtime UPS, it does its job without fanfare or fuss, and that’s exactly what you want in a unit this size.In day-to-day use, the SL700U behaves like a compact shock absorber. Voltage drops? It catches them. Blips and flickers? It shrugs and gives you the extra seconds you need. Full outages? Well… it’ll keep your small gear running for 10–15 minutes, maybe a bit more if the load is tiny—but this is a UPS you choose for coverage, not marathon endurance. It’s not something you’d use for a full networking rack or anything mission-critical. But for protecting your modem during ISP maintenance, or keeping your router alive while your bigger UPS is rebooting, updating, or being swapped? It’s perfect.Its real value shows up when paired with larger systems. If you’ve got a bigger UPS or portable power station as your primary backbone, this little CyberPower becomes the perfect “inline buffer”—absorbing those moments where the big device switches modes, resets a circuit, or needs a firmware update. Instead of a hard network drop, everything downstream keeps humming along as if nothing happened. For anyone who works with layered power systems or wants belt-and-suspenders protection for the gear that holds everything together, the SL700U fits that niche beautifully.It’s not designed to be an all-purpose safety net, but within its intended role it’s wonderfully reliable. Treat it as the “hiccup protector” for sensitive electronics, especially in modest or home office setups, and it will earn its spot. Just don’t ask it to run a switch stack or an office during a blackout—this is the helpful sidekick, not the hero.Pros• Slim, compact, and easy to place behind desks or network shelves• Ideal for modems, routers, ONTs, and other low-draw devices• Smoothly handles flickers and short drops without reboots• Perfect as a buffer behind larger UPS or power systems• UL certified and generally very reliable for its classCons• Very limited runtime—10–15 minutes max under typical loads• Not suitable for full racks or high-draw equipment• Standby design means it’s not as smooth as line-interactive models• Battery longevity is decent, but not exceptional

We've had an issue with frequent power surges causing our xfinity router/modem, hubitat hub, ethernet switches, and Lutron hub to power cycle. Problem was that the xfinity takes forever to get started up and then the Hubitat quits trying to connect and I'm forced to climb a ladder to reboot Hubitat. Now with a battery buckup the problem is solved and proven by a short outage yesterday. Also added a Shelly smart plug in between the hubitat and the UPS and programmed a script to delay bootup in case the outage is long enough to kill the UPS then the hubitat will wait a few minutes before powering up to let the xfinity modem/router boot up first. Modern day solutions for modern day problems.

i've used only APC brand for years and they gave me lots of headaches over that time....so i thought i'd try this brand....i think it works a little better, has a nicer user interface, and hopefully will go longer than 3 years....plus its about 10% less money...........the one place i really had a lot of trouble was tracking down the downloadable free software that goes with it...the official website was nothing but blind alleys which is totally unacceptable...in the end i had to ask Claude to find it for me

Good supply. I've had no issues with using it.

I got this because it was about 1" thinner than the other brands of surge protectors/UPS brands. I have a tight spot behind a bunch of equipment that it needed to go in. After moving my equipment and placing it behind everything it worked fine for about a week until I experienced a power blip for less than a second. The unit then started beeping a few times every 30 seconds and wouldn't stop. There was no way to stop the beeping other than moving all my equipment and unplugging the unit which defeats the purpose of have an uninterrupted power source. I decided the unit must be defective and decided to return and replace with another one. Exchange process was seamless and another one showed up a few days later. I then had to move all of my equipment again and switch them out. About 2 weeks later I experienced another power blip and you guessed it- the same thing happened. What good is a UPS that won't stop beeping unless you unplug it? Absolute garbage!I replaced with an APC brand and haven't had a problem since. Don't bother purchasing unless you want to unplug it everytime there's a power blink. Useless

Works great. And amazing customer service.

Bought this because of the form factor and it does not disappoint. Fits perfectly where I needed it to go and so far it appears to work just fine. No idea how long the battery will hold up for and what other features it has I don't have it connected to a computer.

I asked the Amazon community a while ago about if anyone knew how big the internal circuit board was for the Cyberpower SL700U battery backup? No one could give me an answer and since this unit seemed to be the smallest, most compact design for a larger 700 watt backup supply on the market, I decided it would do for my purposes.I am writing this review not as an end use of the actual device, but to re-purpose the battery backup’s structure, it still functions as intended, just in a different package and I believe that customers may like to see how these units work as well as how they can be modified (yes, you will void the warranty)I make computer hard drive backups and restorations every 2 months, for myself and others I help with their operating systems, so I use an external data backup device: Startech SM2DUPE11. Previously I used an earlier model that could not do NVMe style drives but was still efficient and quick. When backing up data of any type, it is best to have a power supply that won’t fail on you else you may lose your destination drive or corrupt the source data if you have a blackout. The UPS is the answer. The duplicator needs a home, so a good solid case to carry and store it in makes sense. Last, the UPS, which I integrated into the case, adding in a couple of features and using components to replace the circuit board mounted power switch and power LED indicator light. I decided to add in a power receptacle in case I needed to plug something in while doing the backup off site.Designing the layout on an acrylic plastic board and then drilling, cutting and filing out slots and holes, modifying the two heat sinks on the Cyberpower SL700U’s circuit board and adding in a separate 12 volt DC power supply to power two small 40 mm fans to cool those two heat sinks I shortened, all of this needed careful planning on how to arrange everything. The Startech duplicator’s power supply adapter also needed a parking stall in the layout. So after removing it from it’s case, and trying a few positions with two slimmer 6 volt batteries to power the UPS during a power outage, I had my plan.The original Cyberpower battery was 2 inches thick, and obviously I could not use this effectively if trying to place it flat inside of the carry case I used, the Nanuk 910 case. I found a flatter, 1.3” thick, 6 volt battery to use, but I would need two of them instead of one. You can replace a 12 volt battery with two 6 volt ones if you connect them in series. This gave me the advantage of increasing the amp hour rating from the Cyberpower’s 5 amp hour 12 volt battery to 7 amp hours for the replacements. My project took a while to accumulate all the needed components, all ordered through Amazon, and once I had replaced the short battery cables on the circuit board with lengthened ones, and soldered on wires to connect the switch and LED light, I was ready to assemble.The photos show the SL700U disassembled then it’s circuit board being put together and mounted to the underside of the acrylic plastic board. I consulted with the Startech technical support to confirm that their duplicator being placed so close to the UPS power supply would not cause any issues in its operation and they confirmed that there should be no problem.The project is done and my SL700U powers my duplicator station, protecting this investment from power failures as well as surges during normal operation. I am pleased that I chose this particular device, the Cyberpower SL700U, as it was a great compact design that I could incorporate into my plan and provide power for the nominal 60 watt power usage of the duplicator. This should prove me with many years of service.Hope this helps you decide if the SL700U is for you.

I am satisfied with the product. It meets my needs. I removed a star because there is no way to put it on mute mode. When a breakdown occurs, there is a beep every thirty seconds. Competint products all have this mode so it is an aspect to be updated. It is possible to remove the speaker on the other hand this removes the low or out of use battery warning.

Found out today it only last 1:45 minutes…Not impressed..!!