The Intelligent Lithium-ion battery which powers the VIXIA HF21 is a major advance. It not only more accurately tracks remaining battery life, it also gives a display in minutes remaining. It will allow you to better plan your shooting, so you won't be caught out with a battery that suddenly goes from "half" to "empty." You'll find this especially useful since it lets you take full advantage of the long recording time capability of the VIXIA HF21. You'll capture all the action.