Replacement battery fits 11 Roland compatible models. Specifications: 4500mAh, 24V, Ni-MH. Compatible with: FR-8x, FR-8xb, FR-7x, FR-7xb, FR-7i, FR-7 and 5 more compatible models. Replaces: Roland BTY-FR, Roland FBC-7, Roland BP-24-45. Roland replacement battery designed for Music devices. Built to OEM specifications for reliable performance.