Yeah I know the battery life was always good, but considering rechargeable batteries degrade (and these readers sometimes even come with defective batteries it seems) the more capacity the better. And besides, the less often you have to charge it the better (less of a bother).
So if PRS-950 has stronger batteries then the PRS-505 (which would be very easy to tell if only stupid Sony gave exact specs for it's devices on it's site), or consumes less power for turning pages (due to Pearl display technology maybe consuming less power then Vizplex ?) that would be a plus in my book, and another reason for upgrading (others being mainly contrast, display size, refresh speed and touchscreen).
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