My mental model of a charger is that you plug it in and electricity fires out of it like a hose whether you like it or not. When I plug in my macbook charger, it often takes a few seconds before the light comes on and the menu bar icon says charging.
MacBook – Why is there a pause before the light comes on/mac starts charging when plugging in
batterychargingmacbook pro
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Best Answer
The typical process of charging a battery:
First the system detects the power plug.
Now the Battery status is evaluated and and the battery circuit determines the amount of current to draw.
It is not like a hose, it is a calculated current amount. In other words the battery is the boss and only takes what it needs without overheating or damage.
If you look at you battery Icon in the menu bar you will see it takes a moment or two to determine how long it will take to charge to 100%.
Once that process is completed and the charging is on the way, you are given a visual indication (LED) of activity.