Replacement battery fits 12 ARSEL compatible models. Specifications: 4000mAh, 3.6V, Ni-Cd. Compatible with: AK-468-1, AK-468-2, AK-468-3, AK581, AK582, AK583 and 6 more compatible models. Replaces: ARSEL AK-58. ARSEL replacement battery designed for Emergency Lighting devices. Built to OEM specifications for reliable performance.