Apple - Are there any apps to diagnose a Macbook battery?

On my MacBook, if I opt-click on the battery in my menu bar, it gives me current the condition of my battery.

You can also use iStat to show the current state of your battery.

They are several solutions :

• coconutBattery, the most famous one.
• Watts seems nice even if I never manage to finish to calibration setup …
• Battery Health if you want a free one.

You can also use the built-in tool System Profiler to check your battery :

I can suggest some easy hint to inform you about the health of your battery: go to utilities > System Profiler select Hardware > Power > Battery Information

The third section is Health Information, where you can find out the current condition of your battery. As in the following screenshot, the Cycle count is 213, which means the battery has been discharged and recharged 213 times. And its current Condition is Normal.

Also, you can install Battery Health Monitor to get more information about your battery.

Also, it's a good read about the maximum Cycle count of your battery