Monitoring a Battery health is a vital thing to do if you want to maintain a good lifespan of your Macbook battery.
Though there are numerous Apps available for Mac which can be used to monitor battery health,none of them are simple and light as Coconut battery.
The best part of this app is : It is free. [Download Here]
This 542Kb App (!) can be used to monitor normal parameters like current Charge level, maximum charge, maximum charge, currently capacity and design capacity.
It also displays some critical parameters of battery like Battery Load cycle, Temperature and Power usage.
Recently It has added a online service through which you can compare your battery stats over a period with others and you can approximately get a idea about when the battery will become dead.
Below you can see the graph for my Macbook pro 9,2 model
Battery capacity vs No. of load cycles
Battery capacity according vs Age of your Mac
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