When trying to find the correct APC replacement battery box for a specific APC ups system, the first step is to get the model of the device.Models can be found on the back-On the side of the unit on a small white label (where is the socket ).If the tag you find also states the serial number of the device, you can be sure that you are looking in the right place.Finding the right APC replacement battery using the exact model of your device will ensure you get a battery --Compatible with your device.Once you have found your device model, the next step is to find and go to the official battery backup system upgrade page of APC.This page is made for the convenience of end users, by the US power conversion company, because they have designed and produced a large number of ups systems over the years.On this site, you simply enter the model number of your unit and APC will tell you exactly what type and size of battery case your particular ups system needs.S. power conversion does offer a simple plug-and-play APC replacement battery that will certainly work on arrival.The only return I see on this type of APC replacement battery is the cost.Instead of actually producing its own replacement battery, the American Power Conversion Company contracted it to a business and branded it.I would say that the company that APC signed must be high.Quality, but the price is to make a lot of money.If you're looking for something that's more cost-effective, there are plenty of other sources to sell your specific APC replacement batteries.If you feel adventurous, then you can physically disconnect the battery pack from your device and try to find it at the local battery store (if you can ).From my personal experience, find a highReplace the premium battery online and ship it to your doorstep.Just make sure you buy from a trusted company reviewed by other customers.Before I finish this conversation, I also suggest you look at the real quality of the APC replacement battery you are going to buy.I do business with two big companies and see them again and again in APC units are CSB batteries and PowerSonic.S. power conversion companies use CSB batteries as an OEM battery replacement for most devices.The PowerSonic brand is a good quality manufacturer of sealed lead-acid batteries and I have been dealing with it for years.From the point of view of quality and reliability, I will make the same assessment of the batteries of the two companies.While the quality and reliability of both companies stand out, it all depends on how much cash you want to spend.You put it in.These APC replacement battery kits are powered-Sonic Battery is a well-known and trusted brand in the sla Battery business and has been around for more than 30 years