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.
Sony NP-FT1 Info-Lithium-Ion Battery (3.6v 680mAh) for DSC-T1, T5, T33, L1 & M1 Digital Camera