My friend works in IT and replaced an IBM 1000THV UPS (APC Smart UPS 1000VA rebadged) for a client. The only thing wrong with it was the batteries were stuffed, however, replacement batteries from APC are about the same cost as a new UPS and the UPS comes with a new 1 year warrenty so clients just opt for the new item. So, more to the point, I received this poor unloved UPS. Now, the APC Smart UPS 1000 and 1500 use the same chassis and as far as I can tell use the same electronics. The only difference are the batteries, so instead of replacing the RBC6 battery pack with generics, I will be replacing it with RBC7 generics. APC Smart UPS 1000Va Specs APC Smart UPS 1500Va Specs The RBC6 battery pack is made up of 2x 12V 12Ah batteries, these are the Jaycar generics: Jaycar SB2489 The RBC7 battery pack is made up of 2x 12V 18Ah batteries, these are the Jaycar generics: Jaycar SB2490 Now notice that the connectors for the RBC6 and RBC7 are different. So I will be replacing the standard connectors. Also note that the APC batteries are linked with a fuse, I will be using the fuse from my old battery pack.