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CyberPower

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

  • Based on 11,446 reviews
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Style: Standby


Size: 425VA


Features

  • 425VA/260W Standby Battery Backup Uninterruptible Power Supply (UPS) System uses simulated sine wave output to safeguard home office and entertainment needs, including computers, gaming consoles, and broadband routers
  • 8 NEMA 5-15R OUTLETS: Four battery backup & surge protected outlets; Four surge protected outlets; INPUT: NEMA 5-15P plug with five foot power cord
  • ADDITIONAL FEATURES: LED status light indicates Power-On and Wiring Fault, transformer-spaced outlets
  • GREENPOWER UPS HIGH EFFICIENCY DESIGN: Reduces power consumption by utilizing a compact charger and power inverter to create an ultra-efficient backup power system for home and office use
  • 3-YEAR WARRANTY INCLUDING THE BATTERY; $75,000 Connected Equipment Guarantee

Description

The CyberPower ST425 Uninterruptible power supply (UPS) system provides battery backup and surge protection for lightning-induced surges and other power events that can damage electronic equipment. This unit delivers enough battery backup to power connected electronics through utility power failure and enough runtime to perform a graceful shutdown to protect against the loss of data and damage to valuable electronics during longer outages. Including a sleek design, this UPS is perfect for all your home office and entertainment needs, including computers, gaming consoles, and Broadband routers. With a $75,000 lifetime connected equipment guarantee and a three-year warranty, you can trust CyberPower commitment to the quality of this battery backup with surge protection.

Specs & Other Info

SpecificationDetails
BrandCyberPower
Battery TypeSealed Lead Acid
Dimensions3.2"D x 4.5"W x 8.3"H
Operating Voltage120 Volts
Color SchemeBlack
Weight3.8 pounds
Model NumberST425
Battery Requirement1 x 12V (included)
Release DateAugust 15, 2018
ManufacturerCyberPower Systems
OriginChina

Frequently asked questions

The CyberPower ST425 UPS can provide backup power during outages, but the exact duration depends on the total power load of the connected devices. For a setup with a moderate load like a single PC and monitor, it typically offers around 8-10 minutes of runtime, allowing you to save your work and shut down safely. For lower loads, the runtime increases.

No, the CyberPower ST425 Standby UPS System is not suitable for high-power appliances like refrigerators, space heaters, or air conditioners. It's designed for low-power devices such as computers, networking equipment, and entertainment systems. Its maximum capacity is 425VA/260W, which is not sufficient for high-power appliances.

The CyberPower ST425 Standby UPS System is designed for easy use without the need for special software for basic functionality. However, for advanced features such as power management and scheduled shutdowns, CyberPower offers a free downloadable software called PowerPanel Personal which is compatible with Windows systems. This software can provide valuable insights into power usage and battery health.

The CyberPower ST425 requires minimal maintenance. It's important to check the battery status regularly and ensure the unit is kept in a dry, ventilated area to prevent overheating. The battery typically needs replacement every 3-5 years, depending on usage and environment. CyberPower provides instructions for safe battery replacement, and it's a process that users can often do by themselves.

Similar Products

Top Amazon Reviews

πŸš€ Abunda's Overview

This is our summary and key points to consider based on customer reviews.

The CyberPower 425 VA UPS secures critical acclaim across varied reviews for its dependable and efficient power protection, appealing to a broad user base with diverse device support needs. Its compact size, straightforward setup, and quiet operation underline its suitability for both home and small office environments. Moreover, its ability to manage power interruptions gracefully, offering substantial uptime for devices during outages, contributes to its strong recommendation among users.

Pros

  • πŸ”Œ Efficient and reliable power protection for a wide range of devices.
  • πŸ”‡ Quiet operation, even under load or while charging.
  • πŸ‘ Compact design with a simple setup process.
  • πŸ’‘ Adequate power backup time, with about 90 minutes for light loads and around 10 minutes for heavier loads.
  • 🌐 Offers both surge protection and battery backup across multiple outlets.

Cons

  • πŸ”‹ High replacement cost for the battery, which may deter users from sustaining the product long term.
  • 🎚 The audible alert (beep) for power disconnection can be loud and may be intrusive for some settings.
  • 🧰 Modifications for extended battery life require technical skills, limiting accessibility for the average user.

Should I Buy It?

If you're in need of a reliable, compact UPS that can protect a variety of devices from power interruptions without causing a racket, the CyberPower 425 VA UPS is an excellent choice. Particularly suited for those with lower power requirements or those looking to provide backup for essential devices, its merits far outweigh its demerits. However, be mindful of the potentially high battery replacement cost. Overall, if the specs align with your needs, it comes highly recommended.

    • Reliable Backup Power! Great Value in the CyberPower ST425
Style: Standby Size: 425VA
I recently purchased the CyberPower ST425 Standby UPS System, and it's exactly what I needed for protecting my electronics. This compact unit offers 425VA/260W of backup power, which is perfect for keeping my essential devices running during short power outages or preventing data loss from unexpected surges. With 8 outlets, I have plenty of space to plug in my computer, monitor, modem, and other peripherals. The compact size is a major plus – it fits neatly under my desk without taking up much space. The black finish is also sleek and blends in well. Setup was incredibly easy; I just plugged it in and connected my devices. It provides peace of mind knowing that my equipment is protected from power fluctuations and that I'll have a few minutes of backup power to save my work and shut down properly during an outage. For anyone looking for an affordable, reliable, and compact UPS to protect their valuable electronics, the CyberPower ST425 is an excellent choice. It's a great value for the features it provides. ... show more
Reviewed in the United States on April 25, 2025 by Seth Green
    • Compact and Powerful Enough For Modem And Two Routers.
Style: Standby Size: 425VA
CyberPower ST425 Standby UPS System. I got tired of resetting modem and routers each time the power surged or went out for a few seconds. This UPS fit right into the media wall box, simple to use with outlets staggered and flipped positions. In the first week it got its first power outage and performed seamlessly. I don't know how long it could have run with this low load, this time it was only a few minutes. I could just unplug it and see, but, nah, I ain't doing that! Well packaged, easy to set up, reasonable price, fast shipping, good seller! ... show more
Reviewed in the United States on August 27, 2025 by J K
    • Nice unit but small battery and low wattage output
Style: Standby Size: 425VA
Works well but very short time to save your work if the power goes out. Get a bigger one if you want more standby time. Also, don’t overload. This is a small unit good for small standby electronics.
Reviewed in the United States on August 7, 2025 by John
    • Overall good quality
Style: Standby Size: 425VA
We’ve bought a couple of these, they work well, are a great compact size that fits well in any space. The two out of four of ours failed after a half of a second power flicker. When it was time to replace, we came back to this brand, due to its ease of use and generally good quality.
Reviewed in the United States on July 17, 2025 by Jean Curran
    • definitely worth it, conveniently placed outlets.
Style: Standby Size: 425VA
We like these and keep buying them as the old APC ones die off. They are of good quality and last a long time before needing replacing. The plugs are conveniently placed so the plugs with transformers on the ends fit too. a Easy to plug in and use immediately, even though it needs to charge the battery, it'll still work (as long as the power doesnt' go out in the first 8 hours!) ... show more
Reviewed in the United States on July 6, 2025 by Mariel
    • Sturdy, dependable, reliable
Style: Standby Size: 625VA
Been using these batteries for 20 years. Rugged, sturdy and durable. Great for use in hurricanes/ power outages
Reviewed in the United States on September 4, 2025 by Lisa E.
    • It works well
Style: Standby Size: 950VA
My power went down for an hour in the unit was still active. It took me a while to figure out the annoying beep. You just have to hit the power button twice quickly.
Reviewed in the United States on September 6, 2025 by victoria cusumano
    • Competitive value, efficient design, survived a major power surge!
Style: Standby Size: 625VA
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. ... show more
Reviewed in the United States on February 26, 2020 by Jim Gordon

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