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Williston, VT 05495
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Customer Ratings & Reviews

Your price for this item is $62.99
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The comparable value price is $89.99

Customer reviews

Rating 4.7 out of 5 stars with 1023 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 4.7 out of 5 stars

Pros mentioned filter

Cons mentioned filter

97%would recommend to a friend

Customers are saying

Customers express satisfaction with the 850VA Battery Back-Up System's long battery life, reliable performance, and effective surge protection. Many appreciate its reasonable price, ample outlets, and ease of use, finding it straightforward to set up and operate. The unit's size is also frequently praised as manageable. A minor drawback mentioned by some customers is the system's weight.

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 12 Showing 221-240 of 1,023 reviews
  • Pros mentioned:
    Performance

    Rated 4 out of 5 stars

    it works fine

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

    it works fine, although the electricity hasn't gone out for me to properly test it

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

    Rated 5 out of 5 stars

    Easy to set up, easy to use

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

    This UPS was so easy to set up, just plug it in and plug in your devices. It has performed flawlessly since it was installed.

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

    Rated 4 out of 5 stars

    Best one yet

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

    This backup battery is the best one I have owned yet especially for the price.

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

    WORKS AS EXPECTED

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

    I purchased this as a replacement for a similar model I bought 5 years ago. It has more outlets than my last unit and I expect it will last as long or longer than my previous unit.

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

    Rated 5 out of 5 stars

    Love the safety factor of this UPS

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

    Protects computer from power surges, electrical backouts. Love this feature. We live in a monsoon state.

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

    Works - no issues

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

    I had to replace (1st thing Sun morning) a battery back that died after 5 PM Sat because local power company power fluctuations. I've had better luck with CyberPower than APC. Best Buy had the product in stock. Delivery only at OfficeDepot and Staples. Ordered on-line. Was ready for pickup when store opened. Computer up and running as soon as it was plugged in. Does it's job well. What more is there to say. Must have battery backup on all electronic products in FL. Otherwise you have problems.

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

    Rated 5 out of 5 stars

    I like it

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

    Very easy to use, provides plenty of time to avoid crashes. Easily outlast my frequent instantaneous outages

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

    Rated 5 out of 5 stars

    Battery Backup easy to set up

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

    CyberPower - 850VA Battery Back-Up was so easy to set up and has enough outlets to plug everything I needed. Working great so far!

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

    great battery serge protection back-up

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

    Needed a backup serge protector, and needed it fast. Ran over to Best Buy got wonderful help and quickly and were back in business. Wonderful product and great service.

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

    Rated 5 out of 5 stars

    works well

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

    The battery back up and surge protector has ample outlets and is compact enough to fit comfortably under the desk. Good product.

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

    Rated 5 out of 5 stars

    does what is's supposed to do

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

    I bought this to use with my router, cable modem, and Synology server. My power goes out from time to time and also has brown-outs at times. So far, this has worked as it should. It is nice to have peace of mind as well. I've had one time a few years before buying this when the router went down when I was writing to the server. The server thought it had a hard drive failure and I lost everything on that drive. I bought this UPS to help prevent that scenario from happening again.

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

    enough plugs for everything

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

    My last battery back up only had 4 plugs and I had to use 3-ways which created a jungle of wires! This one has MORE than we need so it's easy to trace one when I have a problem. Now I'm organized again.

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

    Rated 4 out of 5 stars

    GOOD POWER SUPPLY

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

    VERY NICE, MY LAST UNIT WAS FROM 1999, SO THIS IS A VERY HIGH STEP UP.

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

    Rated 5 out of 5 stars

    life saver

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

    In our home, we can loose power without any warning, so I wanted something to guard my computer. The more things you have pluggedd into the battery backup device, the less time you will have. I bought the one with 12 outlets and that is fine, but I only have 5 minutes to get my computer shut down before it shuts down for me. But what I really wanted it for was to save the computer from shutting off when the power goes off for only 10 seconds or so. This has worked great, no porblems.

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

    Rated 4 out of 5 stars

    It what I was looking for

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

    This unit is what I looking for have enough backup battery outlet plus the surg protector outlets as well. For as the proformance of this unit can't Comment on it yet haven't had any power to go out since I purchased it.

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

    Rated 5 out of 5 stars

    Great deal, nice product

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

    Does what it should. Time will tell how long it lasts. Plenty of Outlets nicely spaced, good specs for the money.

    I would recommend this to a friend
  • Pros mentioned:
    Surge protection

    Rated 4 out of 5 stars

    Good choice for UPS backup

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

    I have had three of these units (of various amperage) over the years and they have served me well. Good way to provide additional time to safely shut down in midst of power failure or extended run time or surge protection.

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

    Rated 4 out of 5 stars

    Cyberpower UPS works as it should

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

    Great quality for the price. Last one lasted 3 years and worked through many power surges with all the tornadoes and severe weather in my area. Haven't had to replace any of my electronics (TV, sound system, computer, etc)

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

    Rated 3 out of 5 stars

    Basic Battery Back-up

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

    I was expecting this Backup to be able to handle turning on and off the peripheral devices, as a good Backup can do, but the other brand that advertises it can, was not in stock and priced much higher. This certainly works and will be OK, but I can't wait for it to die so I can get a good one.

    No, I would not recommend this to a friend
  • Rated 4 out of 5 stars

    High value UPS

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

    Great price for its battery capacity. I would have preferred a unit with built-in surge protection for network cabling - the only path to computer that this unit does not have. In fact, few if any CyberPower units have network surge protection. Voltage regulation is a feature that competitor units that I have seen do not have at anywhere near this price.

    I would recommend this to a friend
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