The utility company I work for has several old lead-calcium substation batteries that are badly in need of replacement. I am doing some research to determine if there is another kind of battery that will provide a longer life and less maintenance. The manufacturer claimed that these batteries would last 10 years, but it was only three or four years before we started having problems. I have chosen to stick with wet-cell batteries for now, since using dry cells would require a change in our standards and practices.
One type of battery I am looking into is lead-selenium. Anyone familiar with this type of battery and its pros/cons? I have been told that there may be some environmental concerns. Also, any other type of wet cell (and manufacturer) that has proven to function well in your substation applications?