Li-ion and polymer batteries (like the one in your MacBook) last the longest when operating between 30 and 80 percent. Keeping your battery at 100% at all times can shorten the lifespan of your notebook significantly. More information can be found here
AlDente writes the desired value to your MacBooks SMC (System Management Controller), which handles the rest. For everyone that is curious, the modified SMC key is called "BCLM" (Presumably "Battery Charge Level Max")
AlDente is tested and working on pretty much every Intel MacBook from 2011-2020, including:
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