This paper presents the results from a comparative study between two types of valve-regulated lead-acid
battery cells, with uncoated and polymer composite coated absorptive glass mat (AGM) separators. The
volt-ampere characteristics of the studied cells, recorded at different ambient temperatures, show that
the cells with polymer coated separators have significantly lower overcharge (recombinant) current than
the cells with conventional untreated AGM separator. During overcharge, the higher recombinant current
in the cells with plain separator leads to higher cell temperature than that of the cells with polymer
coated AGM separator.