No it stops charging when it reaches 100%
and most batteries trickle charge after 80% to protect the battery and make its usable life longer, however it is advisable to run down your battery at least once a month otherwise it will begin to deteriorate.
If you are not going to be using your mac, leave the battery at 50% take it out and it should not get damaged whereas a full battery or empty one will. This only applies however if you are not going to be using your mac for over a 3 month period.
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