12V 7.4AH Sealed Lead Acid (SLA) Battery for APC ES500 ES550 LS500 RBC110 RBC2

I did my research and this is a quality battery. The price, including shipping, was the lowest I could find for such a good product. Installed easy and is working fine. We have frequent power reductions and the ups along with this battery give me peace of mind.

Easy installation and worked so far so good. I found this replacement on Amazon.com to replace a dead APC ES550 UPS factory battery. It has been working well. Don't know how long it will last but because of the cheap cost I would not worry too much.

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Purchased 2 batteries for a couple of apc ES 550 that have bad batteries. The batteries arrived on time. They look just like the original but with one big difference.

The terminals are about half as wide as on the original apc connectors. The cables keep slipping off the terminals on the battery. If you can manage to get the cables to stay the ups charges and works as it should but I left for a few days and turned off the ups, when I returned and turned on the ups it acted as if there was no battery charge. Looked everywhere for the cause and finally opened up the battery compartment and the negative cable was not nmaking contact. Would be a perfect battery if the terminals were a little larger. (wider).

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I used to buy a lot of APC UPSs because they were cheap on Black Friday. However, the last 5 years or so they have not been on sale and the ones I have are dropping like flies. New ones are $60-80, so I thought I would replace the battery instead. This was my first foray into replacing a battery in a UPS (note I have a fair amount of electronic experience and frequently rebuild Black and Decker drill batteries with the guts from a cheap brand).

I bought this to put into an APC Back-UPS ES 500. This battery physically fits perfectly. It is rated at slightly higher capacity than the original so hopefully that it will provide longer runtime.

Initially it did not function. The terminals on the battery are a little smaller than the connectors in the UPS, so I had to pinch the connectors down a little with pliers to get a good electrical connection. Once I did that it seemed to work fine. At this point only time will tell if it lasts. If it screws up within a year I will post an addendum to that fact.

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I had problems with this APC replacement battery from the day I got it. The positive and negative poles are thinner than on original APC batteries, so the wires do not fit tightly and kept coming off. After having to reconnect them several times, I finally had to tapes the wires down with duct tape. Then after about 3 weeks of use the battery died. The APC unit alarmed and the "replace battery" red led came on. Amazon has a no return policy for batteries, so I just went and purchased a new APC es550 at another store. Just to test this replacement battery, I put it in the new APC 550, and again the "replace battery" led came on. So the battery I got is obviously defective. I wrote to ecom electronics and asked for a working battery since I can't return this one. I will post again when I get their response.

UPDATE: I just received a replacement battery from ecom electronics. They responded to my post right away and I had the replacement battery within a week. For those reasons I am changing my rating from one star to 3 stars. I will install their new battery and see if it lasts longer than 3 weeks. I will post here again once I determine if the replacement battery keeps working for a reasonable amount of time.

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