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. Solid-state pulse-type charger current-limited, temperature compensated, short-circuit proof and reverse-polarity protected. Unit comes standard with electronic lockout and brownout circuits. Sealed dust-proof transfer relay, test switch and LED indicator lights. Long-life, maintenance-free lead acid battery. CSA C22.2 No. 141 certified. Standard 120/347 VAC input with line cord kit.