Yeah I am also wondering about this usb charger. Just got the vapor king today and I am really happy with it. Its Fantastic! Only thing is they tell you to charge the batteries for 8 hours for the first charge. I put one in the usb in my comp and other I plugged into the wall. After 15 mins of red then red/blue at the same time, it went to fully blue. Either its already charged or the usb is not working right. I then took that battery and put it in the wall charge and seems to be taking more charge. Not sure but does the wall charger change color when its done also? Over all though excellent shipping time and great service and product, I couldn't be happier at how this cig performs!
Both chargers work fine, but I just go by time, not lights. USB "should" be fully charged battery when blue, wall charger, "should be fully charged when green. I always let at least 5 battery's charge every night. I know it sound crazy, but, I ALWAYS carry 5 or more VK's with different flavors at all times. I used to smoke 4-6 packs a day though8-o
They will work right, or I will replace. No worries
We also changed warrantee on Vapor4Life products as well. Made it 45 days, which I usuallly never go by anyway

I believe our stuff gotta last, and if you treat it right, it will, otherwise it is manf, defect, and we take care of it.
Vape-On
Steve