I am using my early 2015 MacBook Pro as a desktop by connecting it to an external display, thus, it needs to be plugged in to a charger all the time.
Does charging my early 2015 MacBook Pro all the time damage the battery?
Is it a bad practice?
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No, not at all. I leave my MacBook Pro connected to the charger for days on end sometimes and the battery still works fine. Once the battery gets to 100%, if it is still connected to the charger the MacBook stops charging the battery automatically and allows the battery to go down to 97%, then allows the battery to charge back to 100%, and repeats that cycle until you disconnect the MacBook from the charger. If you've ever charged your MacBook overnight only to find it at 98% or 99%, this is why.
Keeping your Mac plugged in 24/7 is dangerous and will shorten the life of your battery exponentially. From imploding to starting a fire, you should only plug it in when needed. A while back I lost everything when I left my Mac (which was bought recently) plugged in for the week I went to Italy. The battery imploded and I was unable to retrieve anything. For safety and security, do not keep your Mac charging all of the time.