For me personally the user replaceable battery is much more important then the 4mm savings in the thickness of the case. I never use the device without a case and that adds a lot more then 4mm. The thickness isn't an issue.
Batteries do die and things like temperature extremes can kill them early. I know one person who's Cybook battery died and had to be replaced. The incremental cost to design a case that would allow the battery to be replaced is much cheaper then the waste of throwing away the entire device or having to send it somewhere for service.
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