CyberPower ST425 Standby UPS Battery Backup and Surge Protector, 425VA/260W, 8 Outlets, Compact, UL Certified
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Availability:
In Stock.
Arrives
Monday, Jun 8
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Style: Compact
Size: 425VA
Features
- 425VA/260W Standby Uninterruptible Power Supply (UPS): Uses simulated sine wave output to provide battery backup power and to safeguard home office, home entertainment 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 right angle, 45 degree offset 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; 75K USD Connected Equipment Guarantee; UL SAFETY CERTIFIED: Product has been tested in a UL certified lab and listed with UL as meeting or exceeding safety standards
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
| Specification | Details |
|---|---|
| Brand | CyberPower |
| Battery Type | Sealed Lead Acid |
| Dimensions | 3.2"D x 4.5"W x 8.3"H |
| Operating Voltage | 120 Volts |
| Color Scheme | Black |
| Weight | 3.8 pounds |
| Model Number | ST425 |
| Battery Requirement | 1 x 12V (included) |
| Release Date | August 15, 2018 |
| Manufacturer | CyberPower Systems |
| Origin | China |
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.
Style: Compact
Size: 425VA
Power chairs for the elderly are wonderful inventions and help my 98 you dad when he wants to stand and is having trouble. But say the power goes out like it so often does in a Florida storm. What does he do if he is stuck in the chair? If you have a power chair, you need to get a battery backup! We have this one and plugged in his chair and a living room light. It works seamlessly when the power goes out. We used it recently and it gave us plenty of power to move his chair back to sitting up and then some. You want to make sure you don't get a battery backup that gives you just five minutes of use. Get this one. It has plenty of power. We never lost the light during out last power outage. Sitting without power in the light is better than sitting in the dark. Even if you don't have a power chair, get it.
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Reviewed in the United States on June 1, 2026 by Sandy
Style: Compact
Size: 425VA
Supplies enough power for Fiber internet, or Bee link computer Gives you time to save your files and shut down properly. May need a larger unit for flat screen TV. Power surge or Brown out can kill a Roku TV fast. I live 400 feet from a substation. When the breakers open and close, it sounds like a 12 gunge shotgun going off.
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Reviewed in the United States on March 21, 2026 by Wayne D. Andrews
Style: Compact
Size: 425VA
The CyberPower 425 VA UPS proves itself as an efficient, reliable, and quiet solution for power protection, suitable for a wide array of devices including Wi-Fi gateways, Macbook Air, QNAP, and even TVs and streaming boxes. The compact size and straightforward setup make it a versatile UPS for any home or small office. With sufficient outlets - four featuring both surge protection and battery backup, and four more with just surge protection - this unit can accommodate a variety of devices. In terms of performance, the CyberPower 425 VA UPS stands out. It responds promptly to power interruptions, ensuring that devices remain powered on and protected. The unit delivers around 90 minutes of power for light loads like a Wi-Fi gateway, invaluable during extended power outages. For heavier loads, such as a Macbook Air or QNAP, it ensures a solid 10 minutes for a safe shutdown, which meets my expectations perfectly. One of the highlights of this unit is its quiet operation. Even under heavy load and during charging, it maintains a low noise level. Furthermore, I haven't experienced any issues with overheating during prolonged usage, testifying to its overall reliability. Lastly, I assume that the power efficiency of the CyberPower 425 VA UPS is adequate, as there have been no noticeable increases in energy consumption since its implementation. Additionally, I have not needed to contact customer service, indicating that the device works well and lives up to its promises. In conclusion, the CyberPower 425 VA UPS is a top-tier choice for anyone seeking a dependable, compact, and quiet UPS for their essential devices. Whether you're dealing with frequent power interruptions or simply want to safeguard your devices from power anomalies, this UPS comes highly recommended. With its stellar performance and reliable operation, I give it a well-deserved 5-star rating.
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Reviewed in the United States on June 17, 2023 by Gregory Goede
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.
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.
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Reviewed in the United States on April 25, 2025 by Seth Green
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.
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Reviewed in the United States on February 27, 2026 by RPS
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.
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Reviewed in the United States on March 8, 2026 by GR
Style: Compact
Size: 425VA
Works great for electric recline chairs when power goes out
Reviewed in the United States on May 16, 2026 by REOFL