In order to know how many battery cycles you have completed on your MacBook, you can make use of ioreg command on the Terminal, but as this command will print out a lot of information, you can make use of the grep command to narrow down to just use the battery cycle as follows,
% ioreg -r -c "AppleSmartBattery" | grep 'CycleCount" ='
"CycleCount" = 216As you can see the above command outputted that I have completed 216 battery cycles on my Macbook.
This command can be handy when you are building an application or writing a script that needs this information..
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