This is sometimes caused by e-liquid having somehow found its way down there, so give it a good clean with a cloth.
If this doesn't work, you will probably need a new battery. Electric Tobacconist warranty covers you for 60 days from order date. Within this period we will replace the battery free of charge (at no cost to send back to us either)
If you believe your battery is faulty (and your product falls within the 60 day warranty period) please email us at email@example.com and we can often diagnose and/or fix a problem remotely, or send a replacement if necessary.