I just purchased a Smok X-priv. Day one it charged fine of the usb and my computer. The next day when the batteries were drained, I plugged it in and nothing. It wouldn’t charge. Found this site, and upon reading figures I’d have to buy an external charger. Then I tried my iPhone charger, still it wouldn’t charge. I then pulled the batteries, and without turning the MOD on. I again plugged it into the iPhone charger, and it started charging. I have charged it like this twice now. Letting it charge over night. Hope this helps someone else.
Dave Los Angeles