Do I need 100W+ output to charge a laptop?

For 13- and 14-inch laptops, 65W is generally enough to charge while in use. For 16-inch MacBook Pros, Dell XPS 15, or gaming handhelds under load, look for 100W or the newer PD 3.1 140W spec. Specialist subreddit threads repeatedly note that at sustained 140W draw, even large packs drain quickly, so capacity matters as much as peak wattage.