Interesting to hear you can get a 600 battery cheap on Ebay. Let us know if it's any good, plz. Does the 650 use the same battery? Probably not, I guess.
Re: the 650. I sold my 600 because it hurt my eyes and I got the 650. The screen has much better clarity and was significantly easier on my eyes. Still, after a while my eyes got sore again, until I realised I needed a light. Got the Mighty Bright Travel Flex which has solved the problem. Oh, and I use a Bold font, which adds a bit, too.
If you don't already, I recommend using a Bold font on the 600. I imagine it will really help the low contrast.
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