I found that the battery on my PRS950 can drain pretty fast when I have 3g/wifi on and subscriptions to download. On poor connections, it can take a while and sometimes downloads can fail, forcing the device to try to connect over and over.
I get two newspapers delivered every day. Even in standby, between reading and the automated downloads, the device won't last more than 3-4 days without a re-charge (I probably read about 3-4 hours per day on it).
But if I turn 3g and wifi off, I can go 10 days without recharging.
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