CyberPower ST425 Standby UPS System, 425VA/260W, 8 Outlets, Compact, Black

Competitive value, efficient design, survived a major power surge!
ST625U received 2-25-2020 – I have not had a power outage yet but they happen a lot here in Florida during tropical storm season. EDIT UPDATE ON 10/19/2020 – IMPRESSIVE PERFORMANCE OF ALL THREE OF MY ST625U UPS units when a massive sustained power surge from an underground power cable failure burnt up 5 of my home’s stand alone surge protector outlets! My CPAP kept running right through the event while my neighbor’s wall wiring burnt up! All 3 of my 625’s are still working after giving 40 minutes of stand-by power and their breakers did not blow – END EDIT …. SECOND EDIT 10/2023: all 3 of my units and their batteries are still going strong! I just slept through a short power outage while using CPAP END SECOND EDIT. A slight odor of ‘burnt’ electronics right out of the box is normal for some electronics product manufacturing methods, do not be concerned with a slight odor that does not get stronger with use. It will diminish. I tested this unit with my powered 5 motor recliner, an LED desk light and laptop running while it was unplugged from the wall 5 minutes. I will definitely update the review if any issue develops (done!). I’m a degreed biomedical technician and this design looks fine for short term outages. This is NOT for CPAP sleeping use, battery is far too small except for short power outages. The isolated battery compartment opens easily with one phillips screw and only has battery wires inside it. I inspected the battery and found 13.2 volt charge after 6 hours plugged in. The charging circuit is extra energy efficient and causes almost no detectable waste heat, an excellent feature, as claimed on the box. After 6 hours there was only one small area of the case that had a barely warm feeling, like human skin. You can triple the run time when the original battery wears out by adding a larger battery that does not fit in the case, like a 17 AH SLA battery. You have to extend the battery wires long enough to let the battery sit next to the UPS. You must have soldering skills and the right tools to do this. The larger battery will not allow use of larger, more power hungry devices but it will greatly increase run time for your existing use during power outages. The larger batteries cost about the same but they are more durable. I have no interest in setting up the software monitoring. Just a gimmick for this size device. The UPS software may not recognize a larger battery capacity but it might if it is based only on voltage remaining. As the instructions say, this will beep when power goes out but you can mute the beeping in advance by tapping the main power button twice. I don’t know if it retains the mute setting after a complete battery discharge. You can just locate a battery the same dimensions of the original if you want it to fit in the case. It is ‘CPS5.5AH’ 6 inches long, 3 3/4 high without terminals, and 2 inches wide. I decided to buy another one of this model for my modem, router and Ooma phone box to prevent those tedious full reboots after a power glitch.

CyberPower is a good performer but they have issues.
I worked for 40 years in electronics. Cyber Power works quite well. The batteries in them last 3+ years, and they are cheaper than other uninterruptible units. However, Cyber generally lacks features that are common in APC power supplies. (I noticed they are changing and copying popular APC features and holding their prices lower). When Power supplies function well, I like to swap aging batteries for fresh ones. With APC, I had no problems finding the dimensions of their batteries and ordering them. I have some APCs operating for 16+ years, which I consider legendary. Legendary costs more. CyberPower sells for less. I use one 425W to maintain power interruptions from my internet. Light loads are handled well, but my main Peave with CyberPower are two things. 1. “No user installable batteries for the 425.” (let me be the judge of that.) That is bull-puppy! The battery dimensions cannot be referenced in their 425 Watt. 2. CyberPower batteries and shipping cost more than buying a new unit. I hate to pitch a functional product in the junk because the battery lived to a ripe old age or faded away.All batteries should be easily located by dimensional searches. (They are not.) I have spent hours wasting away when a battery does the same thing regardless of how you shape it..

Doing its job
Using it to supply power to powered loveseat that has Bluetooth built in. Working great. Layout of plugs works great for this. I believe uninterrupted power supply helps things last longer and run better due to go smooth flow of current always.

Does what it’s advertised to do.

Compré este no break por temor que el ps5 se me fuera a dañar en un apagon, hasta el momento ha funcionado con normalidad, de acuerdo a las instrucciones hay que cargar la pila por 8 horas y luego de eso, se conectan los equipos de interés, es importante tener en cuenta los watts que consumen los equipos que deseas conectar, por ejemplo el ps5 puede consumir maximo 250, con eso en mente decides cual se ajusta mejor a tus necesidades

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.