Got my ego 650 mah twist yesterday and charged it up. Started using it around 7 pm. I mostly used at 3.5 volts on 1.5 and 2.2 ohm cartos. I used it for about 3 hours on and off (no heavy vaping). Woke up this morning and used it for about 30 minutes and it went dead. Is this all I should expect from this battery 3 1/2 hours on a full charge? Also the button is starting sticking immediately. Did I get a dud? Should I contact the vendor?