Hey fahimu10,
If we understand correctly, the Maximum Capacity on the MacBook Pro is going down at a different rate than another computer. We can help explain what maximum capacity is. While this article says iPhone battery, the maximum capacity information is the same.
"Maximum battery capacity measures the device battery capacity relative to when it was new. A battery will have lower capacity as the battery chemically ages which may result in fewer hours of usage between charges. Depending upon the length of time between when the iPhone was made and when it is activated, your battery capacity may show as slightly less than 100%."
iPhone Battery and Performance
You can run a diagnostic to troubleshoot any battery issues. You will also be notified in the menu bar if there is a battery issue.
Get help with your Mac notebook battery
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