coconutBattery 2.6.1 gives a piece of information that I've never seen in any other battery meter: The maximum charge level. Why is this important? Rechargeable batteries slowly lose the ability to charge to their maximum level (measured in milliamp hours or mAh). My 1st generation MacBook's battery, for example, was able to get charged up to 5020 mAh back when it was new according to coconutBattery. Over the past two years, this maximum possible charge level has apparently dropped to 4553 mAh or 90% of what it used to be. This is pretty important information since it gives you a clue about when a battery should be physically replaced (i.e., buy a replacement battery).