Insten Best Replacement Digital Camera Battery Pack Compatible with Sony NP-FM50/NP-FM30 Never run out of battery power when you're just about to capture the perfect moment! Time to get extra power for your digital video camera/camcorder. High capacity, rechargeable DC 7.4V Li-Ion battery with premium cell. Latest Lithium Ion battery technology gives the best performance possible compared to other battery technologies such as Nickel Metal Hydride (Ni-MH). Dimension: Approx. 38x20x55mm (W/H/D). Weight: 2.5oz. Operation time: Approx. up to 3 hours. Best replacement for the original NP-FM50 / NP-FM30 / NP-FM55H battery pack.