I bought a MacBook Pro 13 inch 2017 two days ago and it’s been already 4 cycles
Is it something that I have to care about?
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The charge holding capacity on MacBook's battery drops after they have consumed a certain number of cycles.
From the Apple Support document, About Mac notebook batteries:
Batteries are expected to function for a certain number of cycles. This number represents the sum of total and partial discharge cycles throughout the life of the battery.
Refer to the Apple Support document, Determine battery cycle count for Mac notebooks to determine the battery cycle count.
Batteries have a limited amount of charge cycles before they're considered to be consumed. Once consumed, a replacement battery is recommended. You can use your battery after it reaches its maximum cycle count, but you might notice a reduction in your battery life.
A dedicated Apple website, Batteries - Maximizing Performance contains tips to get the best out of your MacBook's battery.
It's clear that it's a good idea to prolong the safe count charge cycles. It is okay to use the MacBook plugged in all the time, just like a desktop. However, you shouldn't go for weeks without discharging.
I personally make sure to completely drain the battery on my MacBook Pro once a month.
A couple more links for you to refer: