Quote:
Originally Posted by astra_lestat
But Cybook Gen3 has 5 days or 1 week of life time from one charge. Sony has 3.5 weeks. You can afford to loose 1 week per year and still use it for 3 years 
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That's rather misleading, AL

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The Sony and the CyBook use their battery in rather different ways. The Sony's power switch puts it into "standby" mode where it's still running the o/s. The CyBook's power switch genuinely turns it off, where it's using no power. If you're a relatively infrequent reader (say a couple of reading sessions a day), the CyBook is likely to have a longer time between charges than the Sony because it's not draining the battery between uses.