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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 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

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.

    • Perfect for Keeping Internet Running During Outages
Style: Compact Size: 425VA
This has worked exactly as we hoped. We bought it to keep our internet running during power outages, and it recently proved itself during a brief power outage. The battery backup kicked in immediately, and our modem and router stayed powered without any interruption. It was easy to set up, has a compact design, and gives us great peace of mind knowing we won’t lose our internet every time the power flickers. If you’re looking for an affordable, reliable battery backup for your home network, I highly recommend the CyberPower ST425. ... show more
Reviewed in the United States on July 24, 2026 by Chelsea
    • Perfect for keeping the Internet on
Style: Compact Size: 425VA
Wanted this to keep my router and modem on during power outages and worked great! My TV however still shut off, but I think it's due to it being cheap and doesn't have a good power supply. However my main concern was my internet staying on. I've seen some reviews about people using this for a PC and it not working. Well, this shouldn't be used for that, you need a more powerful UPS. This item is great for smaller things such as a router or a modem, maybe a small fan. I definitely recommend this! ... show more
Reviewed in the United States on July 15, 2026 by Anjelica
    • Keep your Internet alive long enough to sace your work
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. ... show more
Reviewed in the United States on March 21, 2026 by Wayne D. Andrews
    • Pretty good UPS
Style: Compact Size: 425VA
Works pretty good once you figure out how to stop it from beeping regularly while the power is off. I'd advize looking that up BEFORE the power goes out in the middle of the night, unlike what I did.
Reviewed in the United States on June 2, 2026 by π‘»π’˜π’†π’π’—π’† π‘©π’‚π’…π’ˆπ’†π’“π’” π’Šπ’ 𝒂 π‘Ίπ’–π’Šπ’•
    • works as intended!
Style: Compact Size: 425VA
purchased this to keep my wifi router from going out during brownouts. it's summertime and power always seems to take hits. So I installed this device so my router would not reboot every time there is a power blip and the lights flicker. Happy to report , it happened yesterday and it took the hit perfectly... clock on the microwave had to be reset, but we never lost internet and i was able to continue to work. I WFH. easy to setup, small enough to conceal behind the tv, enough outlets for the router and switch and wifi box.. perfectly happy with purchase! ... show more
Reviewed in the United States on July 23, 2026 by bubba from TX
    • Quality product at a good price
Style: Compact Size: 425VA
Excellent choice for a small back up. Use this for my net/wifi. Doesn't need much power but keeps the net from disappearing.
Reviewed in the United States on July 7, 2026 by S Smith
    • 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
    • automatic power standby for multiple,small necessary electronics
Style: Compact Size: 425VA
This is perfect for a device you might have in your home that you need during a power outage. Not meant for a major appliance like a refridgerator or the A/C unit but, in our case, an electronic ignition tankless water heater. We now have hot water during any power outage beause the unit needs just a little electric kick to start up and then it runs on it's own. At the same time I could plug in my cellpone charger or laptop if I found out, during an outage, that I wasn't prepared. Surge protector is a bonus! ... show more
Reviewed in the United States on June 25, 2026 by Amazon Customer

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