I usually charge the Sony way before it gets to 1 bar. I like to keep it fairly well charged most of the time, so I can just just grap it on the run at all times and not have to worry about running out of power.
Having said that, I find it's holding the charge exceptionally well so far (just a few months), and often just keeping it plugged in to the computer for some book organizing (I keep relatively few books on the reader, add and delete quite a lot. Prefer things that way...) adds another bar if it has "lost" one.
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