Skip to contentGo to Product Search
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:
$84.99

Customer reviews

Rating 4.7 out of 5 stars with 1791 reviews

Rating Filter

Rating by feature

  • Value

    Rating 4.6 out of 5 stars

  • Quality

    Rating 4.7 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 70 Showing 1,381-1,400 of 1,791 reviews

  • Great back-up battery

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

    I haven't had a power outage so I can't tell how good it really works, but power is transferring though it just fine.

    I would recommend this to a friend

  • Thankful

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

    During recent storms, I was able to normally shutdown computer during power outages.

    I would recommend this to a friend

  • Works great

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

    We have afternoon thunderstorms almost daily. We purchased this for out internet modem and main DVR. It works great!

    I would recommend this to a friend

  • Nice back-up power.

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

    Bought this to replace one that had a bad battery. Works great.

    I would recommend this to a friend

  • Good UPS

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

    Bought this to be the ups for my old 300w computer when I purchased another. So far, so good.

    I would recommend this to a friend

  • Good Quality

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

    This product is well worth the money. Plenty of ports for my computer, printer and all of my other gadgets.

    I would recommend this to a friend

  • Works great!

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

    just what i needed wish the batgeries were available as well, bur really not terrible to replace whole unit

    I would recommend this to a friend

  • Decent UPS

    |
    |
    Posted . Owned for 2 weeks when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Comes ready to connect. Has adequate number of ac ports. Don't really need any digital display.

    I would recommend this to a friend

  • CyberPower 650VA Battery Back-up

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

    I bought two. The back-ups are more powerful than the replaced units and less expensive.

    I would recommend this to a friend

  • Response

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

    Have bought many of these backup batteries,,,,,,just wish they would last longer !!

    I would recommend this to a friend

  • Easy to use and does the job.

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

    The CyberPower 650VA was ready to go out of the box.

    I would recommend this to a friend

  • Great Battery Back Up

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

    Does a great job keeping the computer running during a power outage. Allows plenty of time to shut it down properly.

    I would recommend this to a friend

  • Works well

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

    This will be the third CyberPower battery backup system purchased for our business. Have all worked well with no problems.

    I would recommend this to a friend

  • CYBER POWER

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

    I LIKE THIS PRODUCT, CYBER POWER I CAN CHARGER MANY THINGS AT THE SAME TIME. I AM HAPPY I BOUGHTIT

    I would recommend this to a friend

  • Great protection

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

    I purchased this unit from Best Buy. I bought it to protect my employers laptop and VGA monitor, so far no issues.

    I would recommend this to a friend

  • Great option for those with lots of plug needs

    |
    |
    Posted . Owned for 2 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Bought this to have more plug options over a traditional power strip. Love the layout and the back up power.

    I would recommend this to a friend

  • Nice battery back up.

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

    I have been using this brand for awhile. I am using this for my home theater media center.So far so good.

    I would recommend this to a friend

  • Great product

    |
    |
    Posted . Owned for 6 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Love this product so much, I had to buy another one. Works great with power outages.

    I would recommend this to a friend

  • Not what I ended up needing but nice unit

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

    Ended up taking this back because my new TV was pulling too much power and this thing kept beeping! Not sure if I was doing something wrong but returned it and got something else.

    I would recommend this to a friend

  • Great sale price. Plenty of connectivity.

    |
    |
    Posted . Owned for 2 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Well made. Bought at a great sale price. Fits my needs with plenty of connectivity.

    I would recommend this to a friend
Page 70, Showing 1,381-1,400 of 1,791 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.