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by wtallis 1108 days ago
Yes, this is what USB-C PD is for. If you have a laptop capable of charging at 100+ W but you plug it in to a 45W charger, it will charge at 45W and maybe give you a notification about slow charging. (Sometimes you'll run into weird exceptions where either the charger or laptop doesn't support a particular voltage or has a lower current limit for some voltages so charging power can end up lower than you'd expect.)