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

Your price for this item is $84.99

Customer reviews

Rating 4.7 out of 5 stars with 1781 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 88 Showing 1,741-1,760 of 1,781 reviews
  • Rated 1 out of 5 stars

    I RECEIVED A BODY MASSAGER

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

    I RECEIVED A BODY MASSAGER INSTEAD! I HAD TO TAKE BACK THE MASSAGER THAT WAS SENT TO ME BY MISTAKE AND RECEIVE THE BATTERY BACK UP SYSTEM AND IT IS NOT THE RIGHT PRODUCT FOR MY HOME

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      Hello,
      Thank you for taking the time to write a review. We're sorry to hear you were shipped the wrong product and that the UPS your purchased doesn't fit your needs. In the future we'd love to help match you with the correct UPS, please contact our Technical Support team at 1.877.297.6937. We hope to hear from you. CyberPower

  • Rated 1 out of 5 stars

    bought it was broken

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

    i bought it and waited almost a month before i used it and it was like broken when i tried to exchange it was to late , unhappy .

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      Hello Alex, Please reach out to our support team at 877-297-6937 and we'd be happy to assist. We look forward to hearing from you! CyberPower

  • Rated 3 out of 5 stars

    Decent price, Concerned about Lifespan

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

    You can tell that these are cheaply made based on the weight compared to other brands that use good, solid transformers inside. However, the price savings is sometimes what the clients are looking for and consider these to be disposable items anyway

    No, I would not recommend this to a friend
  • Rated 1 out of 5 stars

    Mr

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

    The power went out and this started emitting a loud whine and failed to supply power to anything

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      Hello Walt, Please reach out to our support team at 877-297-6937 and we'd be happy to provide assistance. We hope to hear from you! CyberPower

  • Rated 3 out of 5 stars

    Died about a year after I bought it

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

    Died about a year after I bought it, but outside the warranty period. Replacement battery costs almost as much as a brand new unit.

    No, I would not recommend this to a friend
  • Rated 1 out of 5 stars

    This does not work

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

    This unit does not work correctly. I waited too late to return it, but don't buy this

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      Hello, The SX650U comes with a 3 year warranty. If you are within the warranty period or would like assistance troubleshooting, please give our support team a call at 877-297-6937. We hope to hear from you! CyberPower

  • Rated 1 out of 5 stars

    Returned

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

    Bought and charged before PGE turned off the power. This battery wouldn’t even charge my iPhone. Returned to BBuy.

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      Hello Dennis, If there is additional detail you'd be willing to provide, we are always looking to improve our products. Please reach out to our support team at 877-297-6937 as we'd love to hear from you. Thank you for providing your review! CyberPower

  • Rated 1 out of 5 stars

    Battery back up

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

    The product doesn’t work as billed. It beeps loudly and continuously during the short period of time it works.

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      Hello, Please reach out to our support team at 877-297-6937 and we'd be happy to assist. We look forward to hearing from you! CyberPower

  • Rated 1 out of 5 stars

    Would not recommend

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

    This device worked fine but always smelled electrical. Had to replace it for a different, more expensive brand and I'm glad I did.

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      Hello,

      Sorry to hear that this happened with this unit. For more information or for further assistance with this, please contact our Technical Support team at 877-297-6937 Option 1 and we will be happy to answer any questions you have and provide further assistance. We hope to hear from you. CyberPower

  • Rated 1 out of 5 stars

    Maybe just a dud

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

    Hooked it up to the self sustainable power after having it charge over night to test out and it did not work nor did it make the alert sound

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      These units have a 3-year warranty from the date of purchase, if you can contact our Technical Support team at 1-877-297-6937 and select option 1, we may be able to replace it for you under warranty. Thank you for your review Meza! CyberPower

  • Rated 1 out of 5 stars

    Junk

    |
    |
    Posted . Owned for 8 months when reviewed.
    This reviewer received promo considerations or sweepstakes entry for writing a review.

    Awful. It never worked. Buy an APC UPS; I'm never buying another Cyberpower one.

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      Hello Andrew, Did you reach out to our support team for assistance? If not, please reach out to provide more info at 877-297-6937 and we'd be happy to assist. We hope to hear from you! CyberPower

  • Rated 1 out of 5 stars

    Don’t buy! Horrible and a waste of money!

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

    It only last for about 10 min and then stops. Don’t buy!

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      The exact runtime of the unit is going to depend upon the load attached to the Surge+Battery outlets of the UPS. The more items and/or power drawn from the battery outlets, the shorter the runtime. If you have additional questions, please reach out to our Technical Support team at 1-877-297-6937 and select option 1. Thank you for your review! CyberPower

  • Rated 1 out of 5 stars

    Do jot work

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

    When the power goes off this goes off too and the computer also, then what is this for

    No, I would not recommend this to a friend
  • Rated 1 out of 5 stars

    Back up barttery did not work.

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

    The battery back up did not work. An exchange is in progress

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      Hello Bill,

      Thank you for alerting us of your experience. It sounds like you are aware, but just in case, you can contact our technical support team to process warranty services. If you have further questions don't hesitate to call us at 1-877- 297-6937 option 1. Thank you!

  • Rated 2 out of 5 stars

    Could be okay for appliances, but not for pc's

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

    Do not get this for a gaming pc. The wattage is too low to run something so powerful. Go ahead and spend more money on something that will last.

    No, I would not recommend this to a friend
    • Brand response from TechSupport
      Posted .

      This is a standby UPS which supports devices that pull a low wattage. We have a line of units that are designed to back up computers and servers. Please reach out to our support team at 877-297-6937 and we'd be happy to assist. CyberPower

  • Pros mentioned:
    Battery life, Price

    Rated 5 out of 5 stars

    Fantastic product for the price

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

    Works great and a great price. Keeps my pc(350w psu) up for a few minutes when our power went out.

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

    Rated 5 out of 5 stars

    Excellent battery backup

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

    Well worth the money. Plus, a Geek Squad member came out, explained it to me and installed it

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

    Rated 5 out of 5 stars

    Works great!

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

    This was recommended to me by mo son who helped me set up a home server. We needed this so as not to overload my PC. It has been working great.

    I would recommend this to a friend
  • Rated 5 out of 5 stars

    Battery back-up system

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

    This battery back-up system is just what I needed. Has the right number of protected outlets, and blackout protections.

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

    Rated 5 out of 5 stars

    Office Lady

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

    They Rock!! Best batteries ever!!! Can't wait to order more!!!

    I would recommend this to a friend