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[QUOTE=banjobama;1007261]I'm going by the Vaio care software that came with my computer. On keeping the battery 50% charged and on AC power it says "Battery life will be about 50% shorter than the one of the fully charged battery, however, this mode prevents battery degradation and is more effective if you usually use the computer with the AC adapter." So I just do what it tells me. QUOTE]
That's interesting. It sounds to me like the Vaio has a special mode for only topping up to ~ 50%, which they created because so many people run their laptops while plugged in (which is bad for the battery because of the double heat sources--charge and draw). Perhaps it doesn't push much current into the battery in this mode, keeping the heat in the battery at a lower temp than if they just charged at regular power.
Or I could be totally wrong. I just feel badly that you would lose the convenience of portabilty because of that Sony laptop guideline. I can only say that 1) I have many li-ion gadgets from years back that still don't need battery replacement--they've never been subjected to high heat, and 2) there is a chance that using a reader plugged-in would actually diminish battery lifetime (not having a special, plugged-in charging mode like the Vaio).
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