I typically use the included Apple "big" MagSafe charger while at home but if I'm traveling and trying to pack lightly, it would be great to pack a single charger. I've been looking at some of the smaller GaN chargers through Anker, either 18 or 30W ones. Obviously it won't charge "as fast" but if I'm able to bring a smaller/easier-to-pack charger that will still give the laptop some charge overnight/while not using it, that would be ideal and then I can leave my MagSafe one at home in a more permanent "cable management" setting at my desk. I don't want to cause any harm to the MBP battery though if I'm using an "under-powered" adapter... but if the only downside is slow charging, then I'm more than okay with that for those certain circumstances. Any ideas on this? Could I go even lower to the 18W charger? Or lower (and slower)? Thanks!