Sony NP-FD1 D-Series Rechargeable Lithium-Ion Battery (3.6v, 680mAh) for Sony DSC-T70 & DSC-T200 Digital Cameras

Small and lightweight, Sony's Info-Lithium batteries can be charged or discharged at anytime without developing memory effect. This means they never lose their ability to hold a full charge. They also display remaining battery time on the LCD as well as in the viewfinder by continuously communicating with the camcorder. Info-Lithium battery packs have a built-in micro processor that accurately calculates remaining battery life in minutes.