The Laptop Battery plugin reports on the condition, capacity, cycle count and serial number of the laptop battery. Battery condition can be Fair, Poor or Replace Soon. You will be alerted when the battery condition changes.
The maximum capacity can be higher than the design capacity for a new battery.
For more information on battery cycles and cycle life for laptop batteries, please see https://support.apple.com/en-us/HT201585.
Some 3rd party batteries may report an invalid serial number.
Failing batteries can have a really high maximum capacity.