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I was thinking someone should make a black and white android smartphone if it helps the battery to last longer. I would take half a week of battery over a color screen but I'm probably the minority.

You mean like this one: http://www.engadget.com/2013/12/04/yotaphone-e-ink-smartphon... ?

If it's successful, soon enough extended capacity batteries are likely going to start appearing.

There are extended capacity batteries on the market, I use one from zerolemon. For most users they are too bulky.

I think the important value for geeks it that you can have different OS in the same phone

Agreed.

At least they got the SD card, though.