Actual or potential ability to perform, yield, or withstand. Amount to fill. The capacity of a UPS is dependent on its battery autonomy. If you need 8 minutes then you have less batteries if you need one hour autonomy. You will require many batteries up to 1 ton in weight in battery racks or battery cabinets. Business continuity depends on the reliability of the batteries so these must be checked as part of your regular UPS maintenance and UPS service.