Video : 
This ended being an disaster!! See all five parts before you try!!
I probably have about 30 servers in my little data center, but no UPS.
The battery in my UPS died some years ago.Now we have very rarely power failure here in Denmark, but since we had one here in January, I thought that maybe it was time to look at my ups again.
Link to HP R3000 XR 3000VA - http://amzn.to/1QP2hds
Link to HP 407407-001 battery pack - http://amzn.to/1Ijqeqv
Link to R3000 Replacement Batteries - http://amzn.to/1QP2xsU