I did some research but it seems as though people are conflicted about how much power the USB port actually provides; some people claim that the USB closest to the screen produces less power than the one farthest from it, but I'm not too sure about that theory. I have a 2015 13" MacBook Pro which has two USB ports, one on the right side and the other on the left side, and I would like to know the power output of the USB ports if you're going to be charging a non-Apple device (since I understand that Apple devices are able to draw more power or something). And does it really make a difference if you use the right side or the left side one? I'm inclined to believe they are identical in output. The reason I am asking is because I recently had to return my 1.5 months old Bose SoundSport Wireless earphones and got a brand new replacement, and I am not sure why but the battery always ran out before it was supposed to. I have a feeling it could be because I was using my Gear S3's charger but then again I use it to charge my PowerBeats 2 earphones and they seem to work fine. I wanted to know if it would be more practical and safer to use my MacBook to charge it instead of my Gear S3's charger? The representative at Bose told me that it would be wiser to leave it to charge for a while even AFTER the indicator turns green, but I don't understand the logic behind that. Thank you for your help.