See Apple Support Document About battery health management in Mac notebooks.
The battery icon may show "Not charging" and will discharge to around 93% even with the charger connected before charging again. The way it works is that it reduces the maximum charge while plugged in. With the release of Catalina (10.15.5) this is now even more unnecessary as this "battery preservation" technology is now baked into the OS it's called Battery Health Management. Below is a photo from a (circa 2007 MacBook) battery that has been disassembled. All batteries packs have a something called a battery protection circuit which is designed to disconnect the battery from the charging source once it reaches full capacity and disconnect from the load once it drops to a certain voltage.
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