For those sharing times, please indicate if the screen is on or off during charging. It makes a big difference in my experience so far.
I don't really have times to post, unfortunately. But using non-LG chargers, screen off, overnight, one time (2.1A eBay charger) it gained about 20% overnight (graph showed the battery % constantly going up/down/up/down). Another night (1.0A Samsung charger), screen off, WiFi on, it LOST 30% overnight.
It does much better with the LG charger & cable, especially with the screen off, but is still slow IMO if the screen is on (like if using navigation in the car).