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I can add - personal experience only - my battery life on both the 600 and 650 was greatly diminished when I used a memory card.
At first, I thought it was just the 600. I ran the 650 with books in memory only for the first few weeks and battery life was like my 505 and I was so happy! Inserted a memory card full of books - eek, recharge every few days again!
I still use the card and just charge it more often. But one of these days, I'll probably try breaking up my books into a couple or three cards to see if there's any benefit to having fewer books at one time.
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