well there is only 2 things that I would try before sending it back..
if it is a inline battery.. make sure that the battery is in right and not at a angle getting a bad connection..
take a napkin and see if the connection is wet with
juice.. clean it and the end of the atty..
well 3 things.. try another atty.. the connections on it might be good for the battery but not the pass
through.. some the connections get pushed in a bit if tightened too much
if that does not work send it back