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 78 Showing 1,541-1,560 of 1,791 reviews

  • Average power-strip-UPS

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

    An unassuming low-demand UPS suitable for backing up the customer premises equipment at the edge of your home network -- cable modem / dsl modem / ONT and router.

    I would recommend this to a friend

  • Works just like it should

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

    Keeps all my electronics powered up in the event of power loss. No complaints

    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.

    I need a new power pack and decided to get this one . Works great

    I would recommend this to a friend

  • Powerful Back up

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

    Bought this to replace an old unit, works great and more power when needed

    I would recommend this to a friend

  • Great small backup battery

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

    Great backup for short power outages. Enough power to allow you to save an shutdown.

    I would recommend this to a friend

  • Great battery backup

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

    Our house lost power but our internet and security system didn't.

    I would recommend this to a friend

  • 650va ups

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

    needed ups to supply power for pc for about 5 mim till generator kick in. this unit fit the bill

    I would recommend this to a friend

  • Great product at a great price

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

    This item has worked well for my company in multiple applications.

    I would recommend this to a friend

  • Safe back up for clock

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

    Bought this to keep my electric clocks and smart devices powered.

    I would recommend this to a friend

  • Perfect for my needs

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

    Very good product for my electronic devices. I would recommend this product.

    I would recommend this to a friend

  • Backuppower

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

    Great backup power and electric device protector for the money!

    I would recommend this to a friend

  • Amazing

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

    Best thing i ever no joke cat unplugs u in a raid? np got a few mins to plug in lol power out np turn it off your self for real worth the cash

    I would recommend this to a friend

  • Battery Back-Up

    |
    |
    Posted . Owned for 10 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Works as intended, plenty of time to get the computer shut down.

    I would recommend this to a friend

  • Good product, good price with immediate delivery.

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

    The summary is all that needs to be said about this Back-Up system

    I would recommend this to a friend
  • Pros mentioned:
    Ease of use

    Very Good Battery Back Up

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

    Used this for a customer's video surveillance system installation. Supported the DVR, router and modem so system would remain operational during brief power outages. Wall mounted it to save space. Easy to set up and use, dependable (so far). Recommended!

    I would recommend this to a friend

  • Works great

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

    I bought 2 of these to replace older UPS which didn't hold the battery charge.

    I would recommend this to a friend

  • Don't let a temporary power outage ...

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

    Don't let a temporary power outage interrupt your gaming with a battery back up!!

    I would recommend this to a friend

  • Basic power protection

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

    The UPS only provides power for a PC and monitor for a few minutes, but for most people that's enough to manage brief power outages. A solid product for the price.

    I would recommend this to a friend

  • So far wrkd gd..

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

    never been tested..hope it never does..but i assume its wrks..

    I would recommend this to a friend

  • Works as described

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

    Does the job, backs up the power on my computer if the power goes out.

    I would recommend this to a friend
Page 78, Showing 1,541-1,560 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.