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My friend has a PRS300 which has caused her some annoying problems as well. Hers just wouldn't charge ... and we sent it back to Sony. Sony charged the battery and sent back the AC charger for that model. Plugged into the wall the unit charges well. The AC charger does not utilize the USB port ... but plugs into the a hole nearby. I don't know if these are available in the stores ... but certainly Sony has them. They sent this charger to my friend for free by the way. I read that as indicative of its being more reliable to charge via AC than the computer.
My friend, however, doesn't seem to realize that the "charge bars" are not to be trusted. I've told her she needs to charge the book when it gets down to half way, because the unit seems to become glitchy when the battery is low.
I have no idea how long a charge should last on the PRS300 ... but it's probably of shorter duration than my PRS650.
Hope this helps ...
Mary
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