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

4.6 4.6 out of 5 stars 8,013 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Computer Uninterruptible Power Supply Units by CyberPower

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425VA
UPS

Purchase options and add-ons

Brand CyberPower
Battery Cell Composition Sealed Lead Acid
Product Dimensions 3.2"D x 4.5"W x 8.3"H
Voltage 120 Volts
Color Black

About this item

  • 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
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CyberPower ST425 Standby UPS System, 425VA/260W, 8 Outlets, Compact, Black
CyberPower ST425 Standby UPS System, 425VA/260W, 8 Outlets, Compact, Black
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Price-10% $53.95
List:$59.95
-10% $189.95
List:$209.95
-7% $64.99
Typical:$69.99
$99.99$62.99$59.99
Delivery
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Wednesday, Apr 3
Customer Ratings
WiFi signal
3.7
3.7
4.7
4.0
Tech Support
3.5
3.6
5.0
3.5
Value for money
4.1
3.9
4.2
Battery life
3.6
3.8
5.0
Sold By
Amazon.com
Amazon.com
SKE Smartkey UPS
Amazon.com
Amazon.com
SKE Smartkey UPS
power outlets
8
12
6
4
7
6
size
425VA
1500VA NEW
600VA
700VA
600VA
425VA/240W
cable length
5 feet feet
6 feet feet
5 feet feet
wattage
260 watts
900 watts
420 watts
240 watts
voltage
120 volts
120 volts
120 volts
120 volts
120 volts
120 volts
battery composition
sealed lead acid
sealed lead acid
lead acid
sealed lead acid
sealed lead acid
sealed lead acid
weight
3.8 pounds
23.8 pounds
7.04 pounds
8.4 pounds
8.82 pounds

From the manufacturer

CyberPower Backup UPS Systems - Your ultimate Ally In Power
Uninterruptible Power Supply System

Why Do You Need a UPS System?

Even brief power outages can result in data loss or potential hardware damage. A UPS system provides battery backup power to keep your devices running during short outages and provides enough runtime to properly shut down electronics during extended outages.

CyberPower ST425 Standby UPS System - Hotspots

Typical Applications for the ST425

Desktop Computers

Desktop Computers

Ensure seamless power to your PC and make certain you have time to safely shut down your system during a longer outage.

Home Networking/VoIP

Home Networking/VoIP

Keep your smart-home devices connected to your WIFI during power outages and brownouts.

Personal Electronics

Personal Electronics

Don’t let the game end when the power goes out. Backup battery power keeps gaming consoles, stereos, and chargers running.

Home Theaters

Home Theaters

Protect sensitive televisions, projectors, satellites, and cable boxes from power surges and spikes.

CyberPower Standby UPS Systems

CyberPower ST425 Standby UPS System

ST425

CyberPower ST625U Standby UPS System

ST625U

Amazon SL700U Standby UPS System

SL700U

CyberPower SL900U Standby UPS System

ST900U

Customer Reviews
4.6 out of 5 stars
8,013
4.6 out of 5 stars
8,013
4.6 out of 5 stars
8,013
4.6 out of 5 stars
8,013
Battery Power
425 625 700 900
Watts
260 360 370 500
Runtime (Half/Full)
6/1.5 Minutes 9/2 Minutes 9/2 Minutes 7.5/2 Minutes
Battery & Surge Protected
4 Outlets 4 Outlets 5 Outlets 6 Outlets
Surge Protected Outlets
4 Outlets 4 Outlets 3 Outlets 6 Outlets
USB Ports
0 0 2 0
Topology
Standby Standby Standby Standby
Wave Form
Simulated Sine Wave Simulated Sine Wave Simulated Sine Wave Simulated Sine Wave
Model Type
Compact Compact Slim Compact
Management Software
Not Available PowerPanel Personal PowerPanel Personal PowerPanel Personal

How long will the UPS power my systems after the power goes out?

Run times vary based on the power required by connected devices. This system is estimated run for 6 minutes at half load, 1.5 minutes for a full load.

Can this UPS model be monitored?

No, the CyberPower ST425 cannot be monitored.

Do all of the outlets have battery backup power and surge protection?

No, not all of the outlets have battery backup power. The ST425 has (4) battery backup and surge protected outlets and (4) surge protected outlets.

Can this unit accommodate larger plugs?

Yes, the ST425 can accommodate four large transformer-based plugs without compromising the access of other six outlets.

How do I mute the alarms?

To turn the Alarm Off, quickly press the power button twice. You will hear two short beeps when the Alarm is turned off. To turn the Alarm back ON, quickly press the power button twice. You will hear a single short beep when the Alarm is turned on.

Product guides and documents

What's in the box

  • UPS System^ User Manual
  • Looking for specific info?

    Product information

    Warranty & Support

    Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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


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    Product 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.

    Customer reviews

    4.6 out of 5 stars
    4.6 out of 5
    8,013 global ratings

    Customers say

    Customers like the size, performance, and power of the uninterruptible power supply. For example, they mention it fits in small spaces, works great, and provides continuous power for a modem, router, and other devices. That said, some complain about the battery life. Opinions are mixed on value and quality.

    AI-generated from the text of customer reviews

    296 customers mention220 positive76 negative

    Customers like the performance of the power supply. For example, they say it works well, and has no issues. Some say it keeps their router running during a power outage, and the alarm still works. Overall, most are satisfied with the performance and functionality of the product.

    "...have not needed to contact customer service, indicating that the device works well and lives up to its promises...." Read more

    "...It has never given me a problem and keeps my Starlink system from going down during power outages. I will definitely buy again." Read more

    "It worked fine for recent power outage. The 4 UPS outlets are enough for my desktop, monitor, modem and router...." Read more

    "Barely does the job. And I’m just powering a T-Mobile hot spot." Read more

    92 customers mention67 positive25 negative

    Customers like the power of the uninterruptible power supply. They say it's great when the power goes out for under 5 minutes or less, and provides continuous power for the modem, router, internet phones, and a NAS. Some customers also mention that the power was fine in the house with no interruption or dip. Overall, most are satisfied with the power and functionality of the product.

    "...Pros: Small Size, Ideal for low wattage equipment. Three year warranty.Cons: The battery can be replaced but is very expensive...." Read more

    "Great for when electricity suddenly goes off & you need that power for several more minutes...." Read more

    "...and lightest UPS I've ever bought, but it also has the shortest full-load runtime. You can't have it both ways, you know...." Read more

    "I have had blackouts in my area and this battery backup works great! It's already saved me several times." Read more

    78 customers mention72 positive6 negative

    Customers like the size of the uninterruptible power supply. For example, they mention it's compact, easy to install anywhere, and versatile. The slim design offers more location options.

    "...425 VA UPS is a top-tier choice for anyone seeking a dependable, compact, and quiet UPS for their essential devices...." Read more

    "Seems to be fully compatible with my synology 1821+, and definitely necessary. Easy setup for though the synology web interface...." Read more

    "...Pros: Small Size, Ideal for low wattage equipment. Three year warranty.Cons: The battery can be replaced but is very expensive...." Read more

    "A decent size and form factor, with good power for the price. Good reliability." Read more

    139 customers mention82 positive57 negative

    Customers are mixed about the value of the power supply. Some mention it's a good value with good power for the price, while others say it'd be a waste of money.

    "A decent size and form factor, with good power for the price. Good reliability." Read more

    "...Three year warranty.Cons: The battery can be replaced but is very expensive...." Read more

    "Good product. Thanks Just what I needed. Great Price too." Read more

    "...smaller version but after almost a month i realized it was not worth the extra 20 bucks. The 50- 60 dollar one is all you really need...." Read more

    122 customers mention74 positive48 negative

    Customers are mixed about the quality of the uninterruptible power supply. Some mention it's reliable, well made, and durable. However, others say that it failed after 3 years and caused a power failure.

    "The CyberPower 425 VA UPS proves itself as an efficient, reliable, and quiet solution for power protection, suitable for a wide array of devices..." Read more

    "...Clicking the button to launch the self-test immediately caused the unit to crash and stop, with all my devices losing power again and the unit..." Read more

    "...The larger batteries cost about the same but they are more durable. I have no interest in setting up the software monitoring...." Read more

    "A decent size and form factor, with good power for the price. Good reliability." Read more

    230 customers mention65 positive165 negative

    Customers are dissatisfied with the battery life of the power supply. They mention that it gave out after about 3 years, and there's just not enough battery power to use it for a long period of time. Some say that the product does not have enough battery capacity to keep a desktop computer from shutting down. Overall, customers are not happy with the product's battery life and recommend looking for s different power supply option.

    "...The UPS software may not recognize a larger battery capacity but it might if it is based only on voltage remaining...." Read more

    "...Three year warranty.Cons: The battery can be replaced but is very expensive...." Read more

    "The CyberPower 425 VA UPS proves itself as an efficient, reliable, and quiet solution for power protection, suitable for a wide array of devices..." Read more

    "...Con: the power strip is huge and bulky, but that’s good because there is a battery in it. Just expect some size and weight to it." Read more

    Runs my 3/4 hp garage door opener
    5 Stars
    Runs my 3/4 hp garage door opener
    I have no option to add a battery backup with this particular model of garage door opener so this seems to be a decent option. I also plugged in a big night light. This set up is simply so I can easily find my generator and open the door without a bunch of hassle.
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    Top reviews from the United States

    Reviewed in the United States on June 17, 2023
    Size: 425VAStyle: UPSVerified Purchase
    31 people found this helpful
    Report
    Reviewed in the United States on March 22, 2024
    Size: 700VAStyle: UPSVerified Purchase
    Reviewed in the United States on February 26, 2020
    Size: 625VAStyle: UPSVerified Purchase
    16 people found this helpful
    Report
    Reviewed in the United States on February 23, 2021
    Size: 425VAStyle: UPSVerified Purchase
    Customer image
    4.0 out of 5 stars The small size was perfect -- But not a fan of the 12V Battery pack used in this UPS. See Review.
    Reviewed in the United States on February 23, 2021
    Due to the limited room in the cabinet I have to use a compact sized UPS. Not a problem since the equipment's nominal load is only 50 watts and a small capacity UPS works fine.

    Originally I had a Amazon Basics 400VA/255W Standby UPS at this location. But its battery failed after two years use. I could have purchased the CPS3.6-12 (12V2.9AH) battery needed to fix the Amazon Basics UPS but it cost as much as a new UPS.

    So I ordered the CyberPower ST425 (425VA/260W) UPS, with fingers crossed it used a different battery. Upon arrival I checked it out and found that it uses the same battery as my old UPS. Yikes, Murphy's Law got me again.

    Some details about my battery phobia: I have several UPS units in my home. Their batteries last three years at best (two years is typical). Replacement SLA batteries are normally $20 each from Amazon, so it makes sense to replace them. But the adorable little battery used in this UPS is $40 (ouch). I suspect the cost is high because it's not a common battery size.

    Pros: Small Size, Ideal for low wattage equipment. Three year warranty.
    Cons: The battery can be replaced but is very expensive. This situation invites more electronic landfill because users will probably throw the UPS into the trash after the battery dies.
    Images in this review
    Customer image
    Customer image
    12 people found this helpful
    Report
    Reviewed in the United States on February 26, 2024
    Size: 700VAStyle: UPSVerified Purchase

    Top reviews from other countries

    db
    5.0 out of 5 stars Nice product
    Reviewed in Canada on March 22, 2024
    Size: 625VAStyle: UPSVerified Purchase
    Grant Fleury
    5.0 out of 5 stars Works well and switched to battery perfectly.
    Reviewed in Canada on March 17, 2024
    Size: 625VAStyle: UPSVerified Purchase
    Gray Thompson
    4.0 out of 5 stars Good value
    Reviewed in Canada on December 7, 2023
    Size: 425VAStyle: UPSVerified Purchase
    Ed - BC, Canada
    5.0 out of 5 stars Compact Power
    Reviewed in Canada on July 8, 2023
    Size: 700VAStyle: UPSVerified Purchase
    Customer image
    Ed - BC, Canada
    5.0 out of 5 stars Compact Power
    Reviewed in Canada on July 8, 2023
    I asked the Amazon community a while ago about if anyone knew how big the internal circuit board was for the Cyberpower SL700U battery backup? No one could give me an answer and since this unit seemed to be the smallest, most compact design for a larger 700 watt backup supply on the market, I decided it would do for my purposes.

    I am writing this review not as an end use of the actual device, but to re-purpose the battery backup’s structure, it still functions as intended, just in a different package and I believe that customers may like to see how these units work as well as how they can be modified (yes, you will void the warranty)

    I make computer hard drive backups and restorations every 2 months, for myself and others I help with their operating systems, so I use an external data backup device: Startech SM2DUPE11. Previously I used an earlier model that could not do NVMe style drives but was still efficient and quick. When backing up data of any type, it is best to have a power supply that won’t fail on you else you may lose your destination drive or corrupt the source data if you have a blackout. The UPS is the answer. The duplicator needs a home, so a good solid case to carry and store it in makes sense. Last, the UPS, which I integrated into the case, adding in a couple of features and using components to replace the circuit board mounted power switch and power LED indicator light. I decided to add in a power receptacle in case I needed to plug something in while doing the backup off site.

    Designing the layout on an acrylic plastic board and then drilling, cutting and filing out slots and holes, modifying the two heat sinks on the Cyberpower SL700U’s circuit board and adding in a separate 12 volt DC power supply to power two small 40 mm fans to cool those two heat sinks I shortened, all of this needed careful planning on how to arrange everything. The Startech duplicator’s power supply adapter also needed a parking stall in the layout. So after removing it from it’s case, and trying a few positions with two slimmer 6 volt batteries to power the UPS during a power outage, I had my plan.

    The original Cyberpower battery was 2 inches thick, and obviously I could not use this effectively if trying to place it flat inside of the carry case I used, the Nanuk 910 case. I found a flatter, 1.3” thick, 6 volt battery to use, but I would need two of them instead of one. You can replace a 12 volt battery with two 6 volt ones if you connect them in series. This gave me the advantage of increasing the amp hour rating from the Cyberpower’s 5 amp hour 12 volt battery to 7 amp hours for the replacements. My project took a while to accumulate all the needed components, all ordered through Amazon, and once I had replaced the short battery cables on the circuit board with lengthened ones, and soldered on wires to connect the switch and LED light, I was ready to assemble.

    The photos show the SL700U disassembled then it’s circuit board being put together and mounted to the underside of the acrylic plastic board. I consulted with the Startech technical support to confirm that their duplicator being placed so close to the UPS power supply would not cause any issues in its operation and they confirmed that there should be no problem.

    The project is done and my SL700U powers my duplicator station, protecting this investment from power failures as well as surges during normal operation. I am pleased that I chose this particular device, the Cyberpower SL700U, as it was a great compact design that I could incorporate into my plan and provide power for the nominal 60 watt power usage of the duplicator. This should prove me with many years of service.

    Hope this helps you decide if the SL700U is for you.
    Images in this review
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    15 people found this helpful
    Report
    stevey
    5.0 out of 5 stars 425 VA works well for Starlink
    Reviewed in Canada on December 3, 2023
    Size: 425VAStyle: UPSVerified Purchase
    2 people found this helpful
    Report