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PRS 505 lasts average of 78 days.
My PRS 505 battery lasts me an average of 78 days. However, I keep it in Shut Down mode most of the time and read books on my PC. I only keep it in sleep mode when I actually am using it.
I just purchased a PRS 900 and still do not have records on their battery. I will use it the same way as the PRS 505.
However, the PRS 900 has a removable battery and one could buy a spare and fully charge it. Then one could last much longer.
Finally, the PRS 900 has a much quicker way of going into Shut Down mode than the PRS 505.
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