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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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Arrives Wednesday, Jan 21
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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.

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Top Amazon Reviews

🚀 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

  • 🔌 Efficient and reliable power protection for a wide range of devices.
  • 🔇 Quiet operation, even under load or while charging.
  • 👍 Compact design with a simple setup process.
  • 💡 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

  • 🔋 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
    • Awesome.
Style: Slim Size: 700VA
Just what I needed for the storms. Working great when the power goes out, on,out on during bad weather.
Reviewed in the United States on January 9, 2026 by ken bozyk
    • Reliable
Style: Compact Size: 425VA
I use CyberPower UPS's on all of my computers and modems. The batteries last about 5 years and I had to replace one unit in 8 years. They have worked through a number of power failures, and I have used them to recharge cell phones during a power failure. The units give clean power when using a portable generator during a power failure (not a whole house generator). ... show more
Reviewed in the United States on January 11, 2026 by Dezzie
    • CyberPower SL700U: The Little UPS That Catches Power Blips So Your Network Doesn’t Blink
Style: Slim Size: 700VA
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 class Cons • 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 ... show more
Reviewed in the United States on November 26, 2025 by Dan Q
    • 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

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