Until only a few years ago, the types of batteries for use with Uninterruptible Power Systems (UPS) were limited to perhaps two or three. This made the selection rather simple. Over the past few years, a number of different types of batteries have appeared on the market. They exhibit varied specifications, environmental requirements, are available in a wide price range, require varying degrees of maintenance and have different warranty periods and life expectancies from two or more than twenty years.

Choosing the proper battery for the application then becomes one of examining these various parameters and choosing the one most suitable for the particular application. The following paper is a comprehensive analysis of various battery types and methods for sizing these batteries utilizing the various battery manufacturers’ data available for sizing.