hi everyone im wanting to know how i would know if my battery is faulty for my ehealth cigarette do u need a certain usb charger i put mine on charge in the wall scocket left it for 8 hours as it said to do so but the green light didnt come on to say it was fully charged so i tried smoking it and just a bit of vapour came out also the end of the cig flashes which means low power i dont know what im doing wrong please help.