Extra Life battery

I really like coconutBattery but I' starting to wonder how accurate it may really be, according to it since I got my Macbook back I not only have a new battery but it holds more charge than it is designed for or originally did ! Not that I'm complaining, the battery life is good but it just strikes me as odd is all....may also account for why slim battery tells me occasionally that I have over 6 hours battery life left

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