IEEE 485:1997 (R2003)

Revision Standard - Superseded.
Methods for defining the dc load and for sizing a lead-acid battery to supply that load for stationary battery applications in full float operations are described. Some factors relating to cell selection are provided for consideration. Installation, maintenance, qualification, testing procedures, and consideration of battery types other than lead-acid are beyond the scope of this recommended practice. Design of the dc system and sizing of the battery charger(s) are also beyond the scope of this recommended practice.
http://standards.ieee.org/reading/ieee/interp/485-1997.html

Expand the scope of the present standard from generating stations to all stationary applications, except for UPS applications which are covered by Std 1184.
This document describes methods for sizing lead-acid batteries for stationary applications. The batteries for these applications are maintained in a fully charged condition known as full float operation.