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The batteries will under normal conditions outlast the life of the device. It is certainly possible to change them, but 4-5 years from now I doubt you could even find a battery for a 300 or a 900. People usually upgrade a device such as this every 2 - 3 years, so for the vast majority of people the battery is a non-issue. Remember that these products are only sold for a year or so, then the new models come out.
No card slot. The 300 holds a good 400+ books, I have never understood why anyone would need more than that to read at one time. Of course you keep your full library on your computer (and have back ups) but on the device, other than slowing it down, there is no real point to having hundreds of books. If you are going to be somewhere for several years without computer access then I can see the point, but otherwise......
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