You can see how much time the device spent on battery power and how much time it spent plugged into a power outlet. The “Usage history” section shows your battery’s usage and duration over time. Both this and the “Recent Usage” section display data for the last three days only.
The “Battery usage” section offers a graph that shows how your battery drained over time. The capacity remaining is displayed as both a battery percentage and a number in mWh. You can see when your device started, when it was suspended, and how much battery capacity drained over time. The “Recent Usage” section of your battery report displays the device’s power states over the last three days. Batteries can only handle so many charge cycles, and different batteries are rated for different numbers of charge cycles. Or, a full cycle could be discharge from 100% to 50%, a charge back up to 100%, and then another discharge down to 50%. So, a cycle might be a full discharge from 100% to 0%. A full charge cycle is measured by 100% battery drain. The cycle count number in the “Installed Batteries” section shows you how many charge cycles a battery has been through. RELATED: Debunking Battery Life Myths for Mobile Phones, Tablets, and Laptops That number will decrease over time as the battery chemistry changes. Note: If you have a new device, it may actually have a higher current full charge capacity than its design capacity. This number will continue going down over time as you use your battery and put it through more charge cycles. For reference, the laptop we used was about five years old. The battery was originally designed to hold 42,002 mWh, but now has a maximum of 40,226, meaning it holds a little less charge than it used to. This is a result of the normal wear a battery experiences over time, and it lets you see just how worn down your battery is. For example, in the screenshot above, you can see that the design capacity of the battery is 44,400 mWh, while the current full charge capacity is 37,685 mWh.
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