Replacement battery fits 8 McMurdo compatible models. Specifications: 1600mAh, 6V, Li-MnO2. Compatible with: Kannad Marine SafeLink AIS SART, Kannad Marine SafeLink Solo, FastFind, Ranger 210, Ranger 220, S5 ais sart and 2 more compatible models. Replaces: McMurdo 91-156, McMurdo BBR-91-156, McMurdo 91-156D. McMurdo replacement battery designed for Marine Safety & Flotation Devices devices.