The ESL Series battery units combine long life expectancy, high-performance design and a reasonable initial cost outlay. Ideally suited for a range of commercial applications, the long-life lead acid battery is specifically recommended for environments where the unit will be exposed to large variances in ambient temperature. Rugged steel cabinet with corrosion-resistant undercoating. Removable front panel on cabinet provides easy access and allows the unit to be mounted at ceiling height. Long-life, maintenance-free lead acid battery.