Replacement battery fits 8 YUASA compatible models. Specifications: 8000mAh, 2.4V, Ni-MH. Compatible with: ONELUX NCD24SS, Mackwell B613, Mackwell B613/24, Mackwell B624, Mackwell B824, 16-552 and 2 more compatible models. YUASA replacement battery designed for Emergency Lighting devices. A precise, secure fit you can rely on.