Where are you getting the units sold figure?
Also keep in mind that people who find a fault are more likely to find this forum than those who don't have any issues with their device. There is also the 'fear effect' where people hear others are having a major issue with sketchy details and suddenly they see themselves as having it.
I'm not saying the One doesn't have a battery drain problem for some, it obviously does, but the number of reports may be inaccurate. Folks may be seeing their devices report false battery levels as the charge gets calibrated, wifi may be left on, etc.
And then there are the folks who had this issue fixed by updating the firmware. I suspect, but can't prove, that if everyone having the issue did a factory reset, upgraded to the current release, and then starting syncing books the number of issue devices would decrease.
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