Small and lightweight, The Sony NP-FM500H Rechargeable Lithium-ion Battery can be charged or discharged at anytime without developing memory effect. This means that it never loses its ability to hold a full charge. InfoLithium battery packs have a built-in micro processor that accurately calculates remaining battery life in minutes, and they also display remaining battery time on the camera's LCD as well as in the viewfinder by continuously communicating with the camcorder or digital camera.