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Harry, you sound like me in always going for the "next best thing." However somewhere along the way I will (every now and then) just keep a gadget long past when others have moved on. My mp3 player for example is the original Creative Zen with 30 GB -- long out of favor.
I expect that there will be several "improvements" in the PRS-5xx line and then a new genration of readers following that. Enhance the b+w reader (i.e.: 16 gray scales rather than 4) and then change the goalposts with the introduction of a color reader.
Each sig change would be associated with a price drop as they are skimming the market now and as the price drops, the sales will increase. By the time the current reader needs a new battery I would expect it to be just a few dollars more to move to a whole new reader. One problem with getting batteries for 5 year old devices is that the new battery was most likely produced around the same time that the reader was produced and has been on the shelf since then.
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