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 76 Showing 1,501-1,520 of 1,791 reviews

  • Good lower price alternative.

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

    Not familiar with Cyber-Power per se, but did not see credible negative reviews. The more known brand has many options I do not need hence this choice.

    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.

    THIS PRODUCT WORKS OUT GOOD. IT CAN SAVE YOU WORK IF THERES POWER FAILURE..LOVE IT

    I would recommend this to a friend

  • CEO

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

    I had a great experience and am enjoying the products purchased.

    I would recommend this to a friend

  • Does the job

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

    seems to do the job in preventing equipment shutdown in power interruption/fluctuation. would have preferred a spacing for power converters.

    No, I would not recommend this to a friend

  • Great Product

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

    Living in Oklahoma with the weather having spare power is a must when you are underground.

    No, I would not recommend this to a friend

  • Must have

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

    Definitely need this when the electricity goes out thank you.

    I would recommend this to a friend

  • Backup

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

    Good last minute purchase when my other battery backup bit the dust

    I would recommend this to a friend
  • Cons mentioned:
    Noise

    back up system

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

    great product but it beeps a lot and not sure if using to much watts at one time. talk to geek squad and there no help.

    I would recommend this to a friend

  • Excellent product

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

    Protects your devices from improper shutdown and keep stable current flowing at all times.

    I would recommend this to a friend

  • good for setting up a small computer system

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

    This is a nice battery back-up system that is nice to be used to set-up a computer system.

    I would recommend this to a friend

  • Great for back up power

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

    We got this so we don’t have to worry about losing Wifi when we temporarily lose power

    I would recommend this to a friend

  • Great battery

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

    We have too many power outages in our area, so this will keep my husbands computer going!

    I would recommend this to a friend

  • Excellent UPS

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

    This power back up is working perfect with my Desktop PC

    I would recommend this to a friend

  • Good product for the money.

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

    So far so good. My last back-up system crashed with lightening strike.

    I would recommend this to a friend

  • Good stuff

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

    It’s good text my computer and my TV very well thank

    I would recommend this to a friend

  • Easy to use

    |
    |
    Posted . Owned for 7 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    The long power cord made it easy to plug in equipment we wanted to back up.

    I would recommend this to a friend

  • Needed in Tucson

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

    Frequent power dips during monsoon thunderstorms. Gotta have UPS for computers, cable box, etc.

    I would recommend this to a friend

  • CyberPower - 650VA Battery Back-Up System - Black

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

    CyberPower - 650VA Battery Back-Up System - Black has been just what I needed for backup power.

    I would recommend this to a friend

  • ok battery

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

    Okay battery backup. I wouldn't purchase this particular battery backup again.

    I would recommend this to a friend

  • Battery Backup

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

    Just plug it in and go. No other have some require.

    I would recommend this to a friend
Page 76, Showing 1,501-1,520 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.