I just got my Efest Xsmart single usb charger, though it didn't come with any instructions, I put my new 18650 battery in it to charge and the light turned red. I'm assuming this means it's charging? ... but you know what they say about assuming it makes a... out of you and me. Anyway... does anyone know? is it supposed to turn red? and then turn green when charged? I tried to find info at the Efest web site but no luck. any info is appreciated.