Concorde Battery Corp. has introduced four Sun Xtender AGM deep-cycle batteries for renewable energy and photovoltaic systems. The batteries, which are available in 12-, 6- and 2-volt configurations, were developed to offer flexibility when designing battery bank configurations. Constructed with valve-regulated-lead-acid absorbed-glass-mat technology, the batteries are non-spillable and maintenance free. Thicker plates than the industry standard offer excellent cycling capability, better float life and extended battery life.