Replacement battery for BTF-114. Specifications: 2.4V, Ni-MH. Compatible with: BTF-114, BTF114, Zumtobel 04879885. Replaces: Zumtobel 1538, Zumtobel ESP-7-58-709E. EXISTALITE replacement battery designed for Emergency Lighting devices. Engineered for consistent power output across many charge cycles.