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Input:
Question: Does this battery fit the APC BE500U  model?
Document: This turned out not to be the correct battery for my UPS. My UPS shows it's a Back-Ups ES 500, but this battery was too large by at least an inch or more. It turns out there's more than one version of the APC Back-Ups ES500. Mine had the model number of BE500 with no other letters in the model number, and took a UB1250 battery, which the seller substituted for the UB1280 without problem. So I ended up with the correct battery for my system, it just took a little longer to get it than originally anticipated.
This is the wrong battery for the APC ES 500. It doesn't fit inside. You want a UB1250 or equivalent.
perfect fit, easy to hook up, seems to hold charge fine. no more irritating beeps from my APC battery backup!
brought my old APC UPS back to life. easy to install. terminals on battery are slightly smaller the APC original but the connectors fit on them with no issues.
While this is a good battery, it s not fit into the APC back up unit for which it is listed. It is too large to fit into the case of the APC unit and I had to leave the case open with the battery on the shelf but connected.
I ordered two of these batteries, one of which I used in my APC Back-UPS ES350 by breaking out the internal webs in the battery case, for a perfect fit. It is now backing up our home theater with a 42 inch screen LCD. The other was used as a drop-in in a Back-UPS ES500. Both arrived with around a 13 volt charge.
Fit exactly and with ease. Indeed, the terminals are smaller that the APC female sockets but are manageable if reasonable care is exercised. Am buying another to replace another aging battery in another APC Back-Up ES500. I always write the date on the battery so I can tell how long they last:  I expect at least 3 years & now we shall see.
Purchased this as a replacement battery for an APC power backup strip. The battery does fit, and does work with the unit. The main drawback is that the size of the terminals are smaller (not as wide) as the original APC provided battery, so the connection with the backup unit connectors isn't all that great. It took me several tries and some electrical tape to get a reliable connection that stayed connected when I put the battery into the unit.That said, once it was finally all connected and powered up, no issues with the battery.
I have been using APC Back-UPS products for fifteen years but always before, when the battery died, I just purchased a new one because the battery replacements were quite pricey--only ten or fifteen dollars less than a new unit. Just for the heck of it I came to Amazon when my battery died this time and was stunned to find a replacement battery at such a bargain.The battery fit the compartment perfectly and works just like the original battery did. I couldn't be happier.
Fits perfectly in the case. You may need a pliers to slightly modify the terminal fittings, but that is no big deal. Depends on the fittings used by APC, which varied slightly over the years. Been running for 10 months now with a few power outages. Works like a champ.Be aware that very early versions of the Back-UPS 500 ES used a different battery with different dimensions. That accounts for the few comments here saying the battery didn't fit. Measure the physical size of your old battery to be sure you are ordering the correct one.
Answer: I have APC BE500U and mine does not fit.  The battery is too thick to let the cover shut by about 1/4".  I'm pretty mad about that.  It will work if I leave it off and let the battery sit on the floor but that doesn't seem safe.