Designed with a 10-year battery life, Trojan Batterys Premium Line of flooded deep-cycle batteries are specifically engineered to withstand the rigorous conditions of renewable energy applications. Th Trojans product strategy is focused on one simple objective manufacture the highest quality battery available in the industry, which is why Trojans Premium Line is tested to IEC standards. Features -Safety - Calcium grid allow reduces gas emissions. Flame arresting one-way pressure relief vent prevents buildup is optimized for high power density. -Efficient - Low internal resistance for higher discharge current and higher charging efficiency.