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. Removable front panel on cabinet provides easy access and allows 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 NEXUS compatible