coconutBattery isn't just a tool which shows you only the current charge of your battery - it also shows you the current maximum capacity of it in relation to the original capacity your battery had as it left the factory.
You also get information about the battery-loadcycles (how often did you fully load your battery), the current charger (coconutBattery even warns you if you plugged in a wrong charger for your Notebook) and last but not least information about the age of your Mac.
coconutBattery gives you all these information just in time because of it's live-feedback interface!
Of course you are able to save the current maximum capacity of your battery - with just one click! coconutBattery uses Apple's new and really powerful technology named "CoreData" to realize this comfortable saving option.