Replacement battery fits 5 Sumitomo compatible models. Specifications: 1600mAh, 7.4V, Li-ion. Compatible with: FURUKAWA S218, FURUKAWA S218R, T-81M, T-66, JR-6. Replaces: FURUKAWA S944, Sumitomo BU-6. Sumitomo replacement battery designed for Equipment/Survey/Test Charger devices. Built to deliver the same performance as the original.