I recently got an 8-gig A-Data card, and also have the battery drain issue (would normally last on standby for several days, but with the card in it drains completely in less than 24 hours). Even with the card freshly formatted, containing no data, I get the battery drain. Top shows virtually no activity, so it's not the metalayer-crawler issue.

Before I was using a Transcend 2-gig micro-SD in a SD converter card, and would get some reduced battery with that (about 3 days life in standby and light occasional usage).