With coconutBattery you are always aware of your current battery health. It shows you live information about the battery in your Mac and iOS device (iPhone, iPad, iPod touch) including:
You are also able to save the current health information, so you can see the changes of your battery over time. With the online service "coconutBattery Online" you even can compare these information with others.
coconutBattery is freeware - if you like it, a donation is always very welcome.
How do I keep my maximum battery health over time?
Among all the tips these should be the most practical:
For iOS devices: The faster your battery is charged the more this affects battery health in a negative way. Charging via USB will often be better for the battery as using a wall charger.
My current maximum capacity is higher than the design capacity. What's wrong?
"Design capacity" is the capacity your battery should have, when it left the factory. As battery manufacturing is still a more or less chemical process, it may be higher (congratulations) or lower when it is put into your MacBook.
Battery percentage on my iOS device differs from the percentage coconutBattery is showing. What's wrong?
iOS uses a defensive calculated battery capacity value to define 100% (and the percentage calculation). coconutBattery reads out the raw battery data and can give you more precise information. (for example you will see that the device actually is still charging when iOS tells you that it is fully charged).
I have a 16GB iOS device. Why coconutBattery says "X GB of 12,5 GB" is used? What happened with the missing 3,5 GB?
iOS takes a quite large amount of your memory. coconutBattery only counts the space that's available for your data (photos, music, apps...)