For those of you experiencing battery charging issues, I did an experiment. Using the LG provided USB cable and AC adapter I went from 2% to 100% in 97 minutes. Using my girlfriends Apple provided AC adapter it was 132 minutes. Keep in mind these AC adapters have different amperage values. Whenever I do anything battery related I always stick with factory stuff. Hope this helps!
Also, for those of you coming over to a G3 from a Galaxy S5, your in for a disappointment because USB 3.0 charges quite fast compared to this. I have not done a test but I heard it is around 40min for the 2800mAH battery in there.