Sigmas SP12-5.5RT 12V 5.5Ah RT Compatible Replacement Battery by UPSBatteryCenter

So far, these are working perfectly. Identical to the original B.B BP5.5-12RT battery. They fit like the original, and now my Cyberpower 635VA UPS's are all working again.NOTE to DIY'ers who own digital multimeters: When you tear down your Cyberpower units, and measure the charge voltage, it will measure zero until you install a new battery, or at least one that can be charged. It's part of their protection circuitry.The label side of the battery will be DOWN when installed, so you can't see the name in the attached picture.

The battery works the way it should like OEM but the price is half of it, would definitely buy it again in the future.

I ordered these batteries because they have F1 and F2 terminal sizes and because it was supposed to have recessed terminals. The terminal sizes were correct but not recessed. I still could use the batteries, but I wanted recessed terminals for a specific enclosure requirement. I still used the batteries but could not use the din rail metal enclosure, so the batteries are just sitting on the bottom of my machine.

Used it for my surge protector and battery back up.

Battery was probably good, but it seems my APC UPS FINALLY FAILED after a power outage or surge when it falsely beeped my prior battery was bad. So of course this battery did the exact same thing and it will cost about half the price of the battery to ship back. The vendor gave advice on how to reset the UPS but nothing worked. I may just keep the batteries and junk the UPS as I have now had for many years. I will replace it with a simple cheap surge suppressor power strip, since where I live I have had far more downtime with the UPS needing batteries than with actual power outages. Its easier to just throw out a surge suppressor if it goes bad and isn't hooked up to something super sensitive with an old style mechanical hard disk drive .

I had an old APC UPS that was just laying around and figured for the price of this battery, I may as well use it.It works well and the price is right.

Bought this to replace the original battery in my CyberPower 625VA UPS which was still working fine after 6 years albeit in reduced backup capacity. It fits fine and the UPS is working after. However this replacement battery totally died (as in UPS would not function correctly anymore with it) after less than 2 years. So definitely does not last as long as the original battery.

This is a special fit Battery.It worked and the problem is :Create a standard size battery for all UPS battery's