Excellent!
Upon lauching Battery Health for the first time, I was surprised by the amount of detailed information being displayed. For example, the age of my battery, the temperature and how many watts of electricity were being supplied to my MacBook at any given time. These are just some of the amazingly cool and useful features! Not to mention, it is very accurate, too.
I strongly recommend this application to anyone who is interested in looking for a detailed breakdown about their battery. As well, how to maximize their use out of a single charge (various tips included). Unfortunately, Apple failed to design Mountain Lion with battery life in mind. Until then, "Battery Health" is the way to go!
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Battery Health - Monitor Stats, v2.5