I am very disappointed with the device and vapefiend regarding this product. I sent back a faulty battery as it does not show any charging / charged indication on the screen when not switched on but plugged in. All that has happened is I've been sent back the same faulty battery with a different USB cable (like I don't have 20+ of them already!) The screen still shows no charging indication when plugged in... ... even with the new cable sent with the old battery. It worked once, the day I opened the box, a big battery symbol showed the first time I charged the device, and it's never been seen since! Does anyone else have this problem?