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"Special" batteries are another method for manufacturers to control the "obsolescence" of an apparatus. Devices that work "forever" are the nightmare of any manufacturer, in the end there will be 7 billion items, and nobody will want a new one.
For me batteries are very important. They should be common, the more common (AAA, AA, R6, R03) the better, as one can find them even in Kenya.
I bought once a budget device. It was supposed to be powered by 2 AAAs (R03). It also looked like. Only at home, after opening the package, I noticed that the battery compartment had indeed been designed for AAAs, yet the mould has been changed and a CR2016 placed instead (I mean "stamped over"). Why? Because a CR2016 will be drawn fast and it costs 2-4€ apiece unlike 2€ for 8 AAAs.
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