A few months ago I spoke here in Skooter Blog on 2 Batteries CSB HR 1234W F2 12VDC 9Ah 34W long life 8 years I used in a UPS Ups APC UPS Backup Pro 1000.
I recently purchased other 2 Batteries CSB HR 1234W F2 12VDC 9Ah 34W long life 8 years, to other APC ups, even older, a APC Back-UPS RS 1500. And also worked perfectly.
I'm not going to repeat here all the information about the battery and the Exchange process, because all this information is already in the article about the first two batteries.
Check out the photos: