Appliances Presidents’ Day SaleEnds 2/25. Limited quantities. No rainchecks.Shop now

Skip to contentGo to Product SearchGo to Footer
Gift Ideas
Main Content

Customer Ratings & Reviews

No content
  • Front. CyberPower - 650VA Battery Back-Up System - Black.
  • Alt View 11. CyberPower - 650VA Battery Back-Up System - Black.
  • Alt View 12. CyberPower - 650VA Battery Back-Up System - Black.
  • Alt View 13. CyberPower - 650VA Battery Back-Up System - Black.
  • Alt View 14. CyberPower - 650VA Battery Back-Up System - Black.

CyberPower - 650VA Battery Back-Up System - Black

Model:
SX650U
SKU:
6239409
Highly rated by customers for:
Your price for this item is $84.99

Customer reviews

Rating 4.7 out of 5 stars with 1780 reviews

Rating Filter

Rating by feature

  • Value

    Rating 4.6 out of 5 stars

  • Quality

    Rating 4.6 out of 5 stars

  • Ease of Use

    Rating 4.8 out of 5 stars

Pros mentioned filter

Cons mentioned filter

95%would recommend to a friend

Customers are saying

Customers have good things to say about the 650VA Battery Back-Up System, especially its long battery life, overall performance, and ease of use. Many appreciate the reasonable price and adequate surge protection, as well as its convenient size and handy USB ports. Some customers have noted minor issues such as a slight humming noise and, in rare cases, random alarm activations. A few have mentioned its weight and isolated incidents of overheating.

This summary was generated by AI based on customer reviews.

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.
Page 50 Showing 981-1,000 of 1,780 reviews
  • Pros mentioned:
    Ease of use

    Saved my 32 gallon tank during summer storms

    |
    |
    Posted . Owned for 11 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Great product, easy to use, has already paid for itself.

    I would recommend this to a friend
  • Pros mentioned:
    Battery life

    WORKS GREAT

    |
    |
    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    NOT MUCH TO SAY OTHER THAN IT DOES WHAT IT IS SUPPOSE TO.

    I would recommend this to a friend

  • Convenient and small

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Size is convenient and it was easy to install. Good number of places for plug ins.

    I would recommend this to a friend
  • Pros mentioned:
    Battery life

    CyberPower review

    |
    |
    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Has plenty of outlets and connected up to my PC with no problems. I would recommend as a good battery backup.

    I would recommend this to a friend

  • Excellent

    |
    |
    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Purchased this for our church & it was everything we were looking for

    I would recommend this to a friend
  • Pros mentioned:
    Price

    Back up battery work

    |
    |
    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Back up battery work very good for the price. APC IS TO MUCH MONEY.

    I would recommend this to a friend
  • Pros mentioned:
    Performance

    it works

    |
    |
    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    It does what it is supposed to do. Still works. Using as I write this.

    I would recommend this to a friend
  • Pros mentioned:
    Performance

    bat

    |
    |
    Posted . Owned for 11 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    this product works well as needed, highly recommend

    I would recommend this to a friend
  • Pros mentioned:
    Price

    Great buy

    |
    |
    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I liked it so much I went and bought another. Good price.

    I would recommend this to a friend
  • Pros mentioned:
    Performance

    Functional battery back up

    |
    |
    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    It works exactly how you would expect. No problems.

    I would recommend this to a friend

  • Fit in and worked great

    |
    |
    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Had to get this for a tight spot. Fit perfectly in the allotted space.

    I would recommend this to a friend

  • Power block

    |
    |
    Posted . Owned for 5 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This has save my new PC I bought from Best Buy from power outages. I am greatly appreciative of this device and Best Buy!

    I would recommend this to a friend
  • Pros mentioned:
    Battery life

    Great product

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This power backup last forever. Bestbuy had the best prices around as well.

    I would recommend this to a friend

  • Excellent UPS for Short Term Backup

    |
    |
    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This is the second unit like this that I have purchased. It has worked without fail during several power outages. I trust that this second unit will perform the same. If the beeping during is not desired, there is an easy way to disable it by just pressing the power button twice very quickly. You can turn on the beeper by doing the same thing again.

    I would recommend this to a friend

  • Battery Backup

    |
    |
    Posted . Owned for 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Compact and many outlets to plug in multiple devices.

    I would recommend this to a friend
  • Pros mentioned:
    Performance

    Clean power

    |
    |
    Posted . Owned for 3 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This unit keeps my server and network equipment running smooth

    I would recommend this to a friend

  • Works as advertised

    |
    |
    Posted . Owned for 1 week when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    I had a power outage and this device gave me time to power down my devices and save my progress. When the power came back all my devices were safe. Worth the price just for that.

    I would recommend this to a friend
  • Pros mentioned:
    Performance

    It works!

    |
    |
    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    It works not much I can say it just works so buy it!

    I would recommend this to a friend

  • UPS

    |
    |
    Posted . Owned for 1 month when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Small enough to fit under my desk and be out of the way

    I would recommend this to a friend
  • Pros mentioned:
    Performance

    Great back up battery

    |
    |
    Posted .
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    This took care of all my computer issues. Thank goodness

    I would recommend this to a friend
Page 50, Showing 981-1,000 of 1,780 reviews
Sign in or Create Account

Get the latest deals and more.

Best Buy appLearn more
Share on YouTubeShare on InstagramShare on TikTokShare on FacebookShare on PinterestShare on X
Best Buy Canada
AccessibilityTerms & ConditionsPrivacyInterest-Based AdsState Privacy RightsHealth Data PrivacyDo Not Sell/Share My Personal InformationLimit Use of My Sensitive Personal InformationTargeted Advertising Opt OutCA Supply Chain Transparency Act
In-store pricing may vary. Prices and offers are subject to change. © 2026 Best Buy. All rights reserved. BEST BUY, the BEST BUY logo, the tag design, and MY BEST BUY are trademarks of Best Buy and its affiliated companies.