If you have a laptop and you don't know how long the battery will last, or sometimes, the battery indicator tells you it's charged but you run out soon after use, then it's time to use Battery Monitor.
As the name suggests, Battery Monitor monitors the battery consumption of your laptop with complete accuracy. Not only that, because Battery Monitor will also inform you of all the technical aspects of your battery, the make and model, voltage, capacity, charge status, and so on.
So you don't lose sight of all this information, Battery Monitor will appear in a corner of your screen as a desktop gadget which you can move from one place to another or change its appearance to your liking. And best of all, Battery Monitor is free.