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CyberPower

CyberPower ST425 Standby UPS Battery Backup and Surge Protector, 425VA/260W, 8 Outlets, Compact, UL Certified

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Style: Compact


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 75K USD 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: Compact 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
    • Excellent little UPS for the money
Style: Compact Size: 425VA
I purchased this device to put on a portable cart that I keep my HP Plotter and a Canon laser printer. My most important use case was for surge suppression. Secondarily need was to be able to move my cart around our without having to reboot the printers. It has worked flawlessly and has a rather amazing battery life. At one point I moved the plotter/printer cart and forgot to plug it back in for several hours and had no issues. Great little UPS for the price. ... show more
Reviewed in the United States on February 27, 2026 by RPS
    • Real life test was successful. I’ll be getting a couple more!
Style: Compact Size: 425VA
The electricity went out very briefly a moment ago. It’s the first chance I’ve had to see if it does work. And it absolutely does. I have a Mac Mini M4, 6 external desktop drives, and a monitor on the UPS side of the device. When the electricity failed, the unit gave a single beep, alerting me and giving me time to turn on the monitor and begin shutting down. Luckily it all came back on before that was necessary. But it would absolutely would have allowed for that much time. It’s affordable and well made by a solid company! I’m going to get a couple more for another cluster of computers. ... show more
Reviewed in the United States on June 17, 2025 by J Schraffenberger
    • Does the job but does not turn back on after battery is depleted.
Style: Compact Size: 425VA
These have been holding up over the years nicely. Only setback is when the power goes out for an extended period of time, these do not power back up on their own. If you use this on a simple home network, and have a concern with a power outage while you are on vacation, this unit is not ideal.
Reviewed in the United States on November 21, 2025 by Dave G.
    • 425 is plenty for most desktop uses
Style: Compact Size: 425VA
Packed properly and it works well. I had no trouble running the cables and adapters after my last UPS died.
Reviewed in the United States on April 5, 2026 by bruce
    • Value quality
Style: Compact Size: 425VA
A little big. But it works perfect. I have basically all my set up there .
Reviewed in the United States on March 10, 2026 by Jose
    • 0% success rate on all three I purchased. buyer beware.
Style: Compact Size: 425VA
I've purchased three of these now, and none of them support even the tiniest load for even a second when the power goes out. I moved into a new old house about a year ago and set up a bunch of electronics. After much research and reading reviews I decided since I need three of these in different parts of the house, I'd get the load needed with a little buffer room to save money. The one in the south end of the house runs nothing but a 1w radio and a 30w fan. The one in my tech closet runs half a dozen small electronics and my home assistant pc. The one in my office should run my home pc, monitors and a few small electronics on a shelf. None more than half the 425 load these should be able to carry. The electricity here hasn't gone out permanently in the year since I moved in, but it has flashed off for more than a minute a few dozen times. First time I used the first unit, it didn't work. Power flashed off and the pc instantly shut down, alarm sounding on the UPS. I took out the battery to make sure it's connected and charged up, all looks great. Next time the power flashed, everything died again. By this point I'd already ordered two more, so now everything in my house that I need to stay running, only for a minute or two, shuts off even when properly plugged into the battery backup side of the ups. Frustrating. These are the cheaper option, but it's still a lot of money for three things probably out of the return window now, that haven't worked once since day one. Spend the money on the better brand, buy once cry once. Now I have to do that too, but I've already wasted the money on these too so cry twice I guess. ... show more
Reviewed in the United States on March 8, 2026 by GR

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