NP-FS12 S Series InfoLITHIUM Battery STAMINA super long battery life Power: 3.6 V, 4.9 Wh, 1,360 mAh Built-in Microprocessor communicates with camera, and accurately indicates remaining battery time in minutes. Technology exclusive to Sony. Lithium-Ion Cells with No 'Memory Effect' Highly efficient, compact and light-weight Environmentally-friendly: 100% free of lead, cadmium and mercury Sony recommends you use only InfoLITHIUM batteries with products displaying the InfoLITHIUM mark.