The Sony's NP-F970 Info-Lithium Battery (6600mAh) is small and lightweight. It provides the advantages of lithium-ion, meaning it can be charged or discharged at any time without developing memory effect. This means the battery never loses its ability to hold a full charge. The NP-F970 displays remaining battery time on the LCD as well as in the viewfinder by continuously communicating with the camcorder. The battery lasts for up to 12 hours on a single full charge. Sony's Info-Lithium battery packs have a built-in micro processor that accurately calculates remaining battery life in minutes.