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CyberPower - 650VA Battery Back-Up System - Black

Model: SX650U
SKU: 6239409
Sold byBest Buy

Customers are saying

Customers highly value the impressive battery life and reliable performance of this product, which many users find to be an excellent value for the price. The device is frequently praised for its ease of installation, convenient surge protection, and practical design features like its compact size and useful USB ports. While the vast majority of feedback is positive, some users have noted minor concerns regarding occasional humming noises, the unit's weight, or rare technical malfunctions. Overall, the product is well-regarded for its functionality and accessibility.

Generated by AI based on customer reviews.
Features
  • 890-joule rating

    Absorbs a high amount of energy to adequately protect your equipment and prolong the life of the unit.

  • 8 surge-protected outlets

    Safeguard the equipment in your home or office.

  • Integrated circuit breaker

    Ensures electronic equipment protection.

  • 5' cord length

    Offers a variety of placement options.

  • ENERGY STAR certified

    Designed to use less energy and meets strict energy efficiency guidelines set by the Environmental Protection Agency and U.S. Department of Energy.

  • CyberPower $125,000 lifetime equipment guarantee.

See all features
Specifications
  • Brand
    CyberPower
    Model Number
    SX650U
    Product Name
    650VA Battery Back-Up System
    Color
    Black
    Volt-Ampere Capacity
    650 volt-amperes
    Half Load Maximum Run Time
    9 minutes
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Reviews

Customers are sayingCustomers highly value the impressive battery life and reliable performance of this product, which many users find to be an excellent value for the price. The device is frequently praised for its ease of installation, convenient surge protection, and practical design features like its compact size and useful USB ports. While the vast majority of feedback is positive, some users have noted minor concerns regarding occasional humming noises, the unit's weight, or rare technical malfunctions. Overall, the product is well-regarded for its functionality and accessibility.
This summary was generated by AI based on customer reviews.
  • Battery Life (345)
  • Performance (266)
  • Ease of use (148)
  • Price (143)
  • Surge Protection (133)
  • Noise (17)
  • Alarm (6)
  • Weight (6)
  • Heat (5)

Customer Images

The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.

  • Rated 5 out of 5 stars

    Excellent CyberPower

    I have never had this product before, but now it has given me an extra layer of confidence and peace of mind with my computer safety. It's working well so far to keep several lower-powered devices (NAS, router, and ISP modem) online and to allow an NAS to gracefully shut down when utility power is lost. While one can plug desktops and other high-power consumption devices into this UPS, they may not stay powered by the battery for long. The outlets are spaced slightly more apart than those in more expensive and capable UPS tower devices. However, for some, the orientation of the plugs themselves may require using larger plugs or wall warts on the top or bottom outlet. The solution, which I assume others do with other UPS units, is to buy very short extension cables that allow one to use larger wall warts. Battery IS user-replaceable. The USB outlets ARE powered by the unit's battery when utility power is cut off. The Synology DSM program will properly utilize this device when a USB cable is connected from the UPS's USB data port on the side of the unit to the Synology NAS's USB port. It networks all my devices, and I shall have to get another. Thanks.

    Posted by Jimmy

  • Rated 4 out of 5 stars

    Good for lower power consumption devices

    Working good so far to keep several lower powered devices (NAS, router, ISP modem) online and to allow an NAS to gracefully shut down when utility power goes out. While one can put desktops and other higher power consumption devices on this UPS, they may not stay powered by the battery for long. The outlets are spaced slightly more apart than more expensive and capable UPS tower devices. However for some the orientation of the plugs themselves may mean putting larger plugs/wall warts on the top or bottom outlet. The solution, which I assume others do with other UPS units is to buy very short extension cables that allow one to use larger wall warts. Battery IS user replaceable. The USB outlets ARE powered by the units battery when utility power is cut off. The Synology DSM program will properly use this device, when one connects the USB cable from the UPS's USB data port on the side of the unit to the Synology NAS's USB port. Its important to understand that these lower end consumer UPS units are not designed to keep your equipment powered for hours at a time. They are designed for keeping equipment powered during short power outages and or allow one to gracefully shut down the computer or other device connected to the battery backup outlets. And it should be noted that most consumer level UPS units do not recommend connecting high power consumption devices like printers or microwaves to them.

    Posted by Benn

  • Rated 5 out of 5 stars

    CyberPower works as it should, and a solid tip.

    I have had quite a few backup systems over the years, but this has the best combination of outlets and stats in its price range. It had an opportunity to prove itself a couple of weeks ago when the power went out. I was able to finish up my work on the computer (iMac) and save with no issues. Here's a little tip for all backup blocks where space for various large plugs and bricks cannot find a home: I bought a six pack of cord extensions for cheap. They are basically a six inch long extension cord that gives you just enough length to allow you to use just about any size brick with no problem. Just search around for them. The photo shows the unit as part of my cable management system.

    Posted by SteveC

  • Rated 5 out of 5 stars

    Save your money and your equipments.

    Really handful and compact, no issues so far, i have to take care of my equipments because of the hurricane season.

    Posted by Yeison

  • Rated 5 out of 5 stars

    Reliable back up, good price.

    As described, reliable back up. Good price, practical and compact.

    Posted by Pedrorodz

From the Manufacturer

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Pros for CyberPower - 650VA Battery Back-Up System - Black
Battery Life, Performance, Ease of use, Price, Surge ProtectionPerformance, Battery Life, Surge Protection, Ease of use, SizeBattery Life, Overall Performance, Size, Surge Protection, PriceBattery Life, Overall Performance, Surge Protection, Ease of use, Price
Cons for CyberPower - 650VA Battery Back-Up System - Black
Noise, Weight, Alarm, HeatNoise, Backup TimeWeight, Noise, USB PortNoise, Weight

Specs

Questions & Answers
  • Is the battery replaceable?

    Hello Samisen, This UPS is field replaceable, thank you for your question.

    Answered by TechSupport
    TechSupport response
  • How many surge-protected outlets does this CyberPower system have?

    This CyberPower system features 8 surge-protected outlets.

    This question and answer was generated by AI based on customer and product data.
  • What is the joule rating of this CyberPower standby UPS system?

    This system has an 890-joule rating.

    This question and answer was generated by AI based on customer and product data.
  • Is this CyberPower standby UPS system ENERGY STAR certified?

    Yes, this standby UPS system is ENERGY STAR certified.

    This question and answer was generated by AI based on customer and product data.
  • What is the cord length of this CyberPower system?

    This CyberPower system has a 5-foot cord.

    This question and answer was generated by AI based on customer and product data.
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