Send it back? Never thought of that. But it weighs a ton!! It's an APC Smart-UPS 1000 which used to look after a couple of NetWare servers. In my case I am sure it is just a duff battery as all the warning lights tell me that. It will even still work if I reduce the load on it. If I run just my monitor and Ethernet Switch from it, then it will work for a few hours before beeping like mad. 
