Replacement battery fits 8 Brooks compatible models. Specifications: 5000mAh, 12V, Li-ion. Compatible with: 80, 180, Bison 80, Acorn Stairlift, Acorn 180 Stairlift, Acorn Bison Bede Bison 80 Stairlift and 2 more compatible models. Replaces: Acorn 10/5000DH-C-SL, Acorn OM0104. Brooks replacement battery designed for Medical devices. Built to OEM specifications for reliable performance.