Most reports of total power drain we've have here seem to be due to people inadvertently leaving the MP3 player playing. Might that perhaps be the cause here, I wonder?
To be honest, unless you need to load content via the memory card (eg if you're a non-PC user) there seems little point in using one. I've got dozens and dozens of books on my card and still only used about 50MB - they would easily fit into internal memory. Perhaps it might be best to stick with loading to internal memory rather than using a card?
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