I am using Rahim Afrooz 600VA ups. I want to use IPS battery in my ups. I need about 1 hour backup and as electricity goes at an interval of 1 hour plz suggest me which battery should I take and the cost of it. And also the procedure to do this mod. Suggest me if anything more is required.

I want to backup my secondary rig (Duel core one). If it possible to backup both my rig with this ups with any battery?