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1) Sinxce I only charge my eReader every week or so, that means the life of the battery will be around 1000 weeks or almost 20 years.
2) Even rechargeable AA or AAA give out with much fewer charnge cycles than lipo packs, so you re even less green.
3) I don't have down time for charging and can read while charging. I use the iGo system and have two chargers. One plugs into the wall, but also has a li-ion battery in it, so I can charge from AC or charge without AC power. The other takes two AA batteries and will charge anywhere. At least with my Sony PRS-650 and -600, if I charge from the iGo, I can read while charging.
4) maknig the device use AA or AAA makes a bulge.
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