Just wanted to let those who have CyberPower UPS's that these batteries work fine. If the physical size and voltage are the same, they will work. If you buy batteries that have a higher or lower amperage rating, it only changes the longevity of the the run-time. I have an old CyberPower AVR-1250 that was sitting in my closet for years with old dead batteries and I wanted a UPS for my 42" plasma, small Denon surround receiver and Direct TV box in my bedroom. The Direct TV boxes ( the non-DVR versions are worse ) take forever to re-boot if the power is lost for any reason, so I dug out the old UPS and found that the CyberPower designated batteries for this UPS cost as much as the deals on some new units that would have been big enough. These batteries were half as much money as a new unit and I really wasn't concerned about the maximum capacity, so I was willing to take a chance on cheaper batteries. These work fine so far. I left it on for several days ( equipment plugged into it ) and then unplugged it and it stayed running in re-gen mode for more than 5 minutes, before I re-plugged. More than good enough. If I turn off the TV and surround receiver the UPS could probably run the tiny Direct TV receiver for at least an hour! The only thing I noticed during installation was a loud pop, and spark that occurred when I plugged the batteries together with the jumper. No harm, just startled me, and everything works fine!