4.8 from   | 10 Reviews

APC  Battery Backup 500VA Back-UPS CS 120V Interface Port DB-9 RS-232, USB B500BLK

  • UPC Code/Product Code : 731304021360
  • Product Model : BK500BLK
  • Brand : APC


  • Computer UPS protects connected loads from surges, spikes, lightning, and other power disturbances
  • Reserves power capacity and run time for connected equipment that requires battery back-up while providing surge only protection for less critical equipment
  • APC battery backup UPS 120V interface port DB 9 RS 232 allows you to quickly understand unit and power status with visual indicators
  • Provides notification of changing utility power and UPS conditions
  • Periodic battery self-test ensures early detection of a battery that needs to be replaced
  • APC Back-UPS CS 500 VA USB B500BLK allows quick, easy battery replacement
  • Automatically starts up the connected equipment upon the return of utility power
  • APC Back-UPS CS 500 VA USB B500BLK enables a quick recovery from overload events
  • Model No.: BK500BLK
  • Shipping Weight (in pounds): 14.5
  • Product in Inches (L x W x H): 14.25 x 9.5 x 7.0
  • Assembled in Country of Origin: USA or Imported
  • Origin of Components: USA or Imported

Reviews for  Battery Backup 500VA Back-UPS CS 120V Interface Port DB-9 RS-232, USB B500BLK

Out Of 5
  • Excellent (8)
  • Good (2)
  • OK (0)
  • Bad (0)
  • Terrible (0)

This product has 10 reviews from customers.
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  • John B

    4 out of 5, reviewed on 02.23.2015


    We buy APC products for their reliability. However they have changed from using right angle plug to straight plugs. Now I have more trouble with bad connections at the outlet than power failures because it is too easy to accidentally knock the plug out.

    Helpful? (0) (0)

  • BWD
    Once Again!

    5 out of 5, reviewed on 07.21.2014


    Once again, this product is just what I need! Replacing the old one was simple, and the fact that I could recycle the old one so easily was wonderful! Thank you!

    Helpful? (0) (0)

  • Graham Toys
    Trust No Other

    5 out of 5, reviewed on 01.29.2011


    I have used APC Back-UPS for over 10 years with various home computers. The batteries do need to be changed at some point around 3-4 years. APC is up front about this. My current Back-UPS CS 500 sits next to my Dell Inspiron quad PC, filters line problems, self-tests, powers after commercial power is removed, and even shuts down my PC gracefully via supplied USP cable according to the params that I set. A PC application lets you initiate a test, review the test log, review power levels and more. It's well worth the price to protect an expensive PC like the one I use.

    Helpful? (0) (0)

  • FuzzyBird
    APC backs up their back ups!

    5 out of 5, reviewed on 01.20.2011


    Had and issue with run time with the first unit I recieved. Called APC service and within 10 min I had a tracking # and p/u tag for the old one. Received the replacement in 4 days. What can I say...APC backs up their back ups!I have found that this product does what it specs out to do!Only issue I have is that the cooling fan is a bit noisy, but the good thing it doesn't stay on for long.

    Helpful? (0) (0)

  • Bernie
    Excellent UPS

    5 out of 5, reviewed on 10.25.2012


    This is a nice compact unit. I like having the outlets on the back of the unit. One of my UPS units has the outlets on the top and they get dusty. I will replace it with one of these when the battery fails.

    Helpful? (0) (0)

  • vaazul
    Completely reliable, great product

    5 out of 5, reviewed on 03.31.2010


    I've been working with this Back-up for a little while now, and my experience has been consistently excellent. As with other APC products I have owned, the craftsmanship is very high-quality and it gives me a high degree of confidence in the product.

    Helpful? (0) (0)

  • stew
    Best equipment.

    5 out of 5, reviewed on 02.12.2010


    I have been using APC products for 16 years. They have never let me down and even when they are outdated. Easy to in stall and manage. I wish more products where built with the same time, concern, and quality as APC.

    Helpful? (0) (0)

  • BMWPaul
    Latest in a long line

    5 out of 5, reviewed on 01.19.2011


    This is my 5th APC UPS. The last one stopped working after 10 years of dependable service. Nothing to do but replace it with something I know I can depend on.

    Helpful? (0) (0)

  • Mickey
    great purchase

    5 out of 5, reviewed on 07.06.2010


    Easy to install, works without a problem. I always order from APC because I can depend on the quality.

    Helpful? (0) (0)

  • AgScThcr
    Good after you understand the instructions

    4 out of 5, reviewed on 01.07.2014


    Instructions need to be written better, but the product works great!

    Helpful? (0) (0)

Questions and Asnwer for  Battery Backup 500VA Back-UPS CS 120V Interface Port DB-9 RS-232, USB B500BLK

  • Carl
    Will this unit automatically shut down the attached devices after AC is interrupted?
    Asked on 12.03.2012

    • APCProductSupport

      Thank you for your inquiry. Yes, the unit will shut down the devices that you have plugged into the Battery Backup side of the UPS and configured to shut down.

  • my64vet
    CS500VA BK500BLK
    Asked on 06.25.2011

    I am looking to buy the BK500BLK for use with a DVR. I am trying to avoid the power disruption during an outage that shuts down the DVR. A shut down requires a reboot by the supplier. Will this product provide continuos flow of electricty until utility power resumes ? It only draws 26 amps.

  • AC
    Will this unit work for a sump pump?
    Asked on 10.27.2012

  • Guest
    I know that Home Depot sells replacement UPS batteries. I can't find them online. Where are they loc
    Asked on 04.08.2013