Small and lightweight, the Sony NP-FM50 Info-Lithium Battery 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. InfoLithium battery packs have a built-in micro processor that accurately calculates remaining battery life in minutes.
NP-FM50: 7.2v, 8.5WH (1180mAh), provides up to 3 hours recording time.