As a general rule, Lithium Ion batteries perform best when they are kept at as full a charge as possible. I don't usually get below 3 bars myself (unless I've done quite a bit of reading with the light on) and tend to "top up" every night. It's not that hard for me as I unload my laptop case and drop several things on chargers (netbook, cellphone, bluetooth headset, Sony Reader); it's kind of my nightly ritual before going to bed.
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