These are some of the best UPS's for your money. Super easy to install and use. We use them for our customers and internally for our essential workstations like our 24/7 service desk. We had a power surge just last month that knocked out power to half the building. The computers with this UPS were not affected by the surge and stayed powered without interruption as we needed them to. I highly recommend the Back-UPS 550. They're more than affordable and can protect highly valued assets.
Recently connected our XBOX & TV to this battery backup. We don't get many power outages, but we did experience a few during Christmas break. It seems to have save a few XBOX games and, with that, many headaches for mom and dad.
The battery had no markings that would enable me to find a replacement on the APC site. Lead Acid Batteries vary according to the ratings. The UPS ES 550 did not have any specifications for the battery. This site is not consumer friendly.
No, I would not recommend this to a friend.
Response from apc.comBy APC Product Support, CCC, September 15, 2016
Thank you for your feedback. We apologize for any difficulty determining the correct replacement battery for your UPS. We do offer a battery selector tool. http://www.apc.com/us/en/tools/upgrade_selector/. We just need the exact model off the UPS, which can be found on a white bar code sticker on the back or bottom of the unit.
I finally broke down and upgraded my UPS. I had a very good UPS from APC, but since I now use Mac OS 10.8.5, I could not make use of the old UPS. The old UPS did not have a usb port. Well, I did buy it new in 2003 and it worked fine with the older Mac OS 9.x. The new one has a usb port and works great so far. All I had to do was unpack it, open the battery cover, plug in the red connector, replace the cover and plug in the power cord and usb connection to my trusty old iMac. Other than possibly needing to replace the battery at some distant time, I am certain I will get a long life from this UPS.
We use these units throughout our company and they work well. This was a replacement/upgrade for one with a battery that was going bad. We seem to get about 6 years + out of a unit before the batteries start to show signs of needing to be replaced. In our areas they are a necessity as we get power outages and spikes enough that without them there could be some serious damage or loss.
I am very happy with APC products, they do protect everything plugged into them. I use them for my TVs, Computers even my modem/router. I hate brownouts ! Now I am using one on my home automation system