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Anak, you're missing the possibility that the Kobo Aura actually might have the same (or even more) battery capacity as other devices, but that one or more of the features it offers draws more power.
For instance, the Kobo Aura uses a completely different sort of page change -- it's not quite as rapid (although still very fast) as the page change on other devices, and it actually (as you'll see if you watch carefully) does a very fast dissolve between pages -- which has the positive effect of eliminating the normal E Ink screen refresh (which causes the screen to briefly bounce to inverse video) that so many people find annoying.
If this, or something else that the Kobo Aura offers that other devices don't (the capacitive touch screen, for instance), draws more power, then it's not, as you chose to paint it, that Kobo chose a smaller/less powerful battery. You simply don't know -- which is precisely why these sorts of supposedly hard-data test-score charts are at best highly misleading and at worse meaningless.
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