I left mine on overnight - it was 70% when I last checked it about oh, noon. And by the next morning (7am) it was completely out of a charge. The drain definitely feels much, much faster with the new firmware.
It also feels like I lose charge even faster when actively reading, although I don't have hard figures from before the firmware update. Just that it feels like I'm 'always' having to recharge.
Not that it's still not much better than a pda or laptop, but it's not as impressive as I'd hoped.
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