Small and lightweight, the Impact NP-FM55H Rechargeable Lithium-Ion Battery can be charged or discharged at anytime without developing memory effect. This means it will never lose its ability to hold a full charge. The Info-Lithium feature also displays remaining battery time on the camera 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.