Small and lightweight, Impact's Lithium-ion NP-FS31 Rechargeable Battery Pack for Sony S Series Camcorders 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.
Replaces the Sony NP-FS31