Extend the life of the party with this black Electro-Voice Battery Pack for EVERSE 8, a replacement battery with smart technology that installs quickly and easily. The lithium-ion battery charges in 4 hours and provides up to 12 hours of use at 95 dB SPL or up to 6 hours at maximum output. The smart technology used in the battery pack prevents issues and includes self-discharge protection that prevents permanent damage from long-term storage. The battery pack includes a cloth carrying case.