I installed a ps af protector(more on that later, surprised i haven't received an email back about issues i've had)...turned up the brightness from where it was...leads to more battery drain, not a ton more, but noticeable. So heres the thing..I used my ipad a lot today, finally maxed it...so at about 18% and knowing I have to use the device for another four-five hours I plugged it in, kept using it. Charging indicator is on...at rest it charges...but in use..it is still dropping percentage. I am REALLY surprised that using the device while plugged in would not only disallow charging but actively drain. Seems like a major oversight to me, the ac charge not being able to keep up with usage. Before you respond with, mine does! Take a min to crack your brightness up high, then plug it in and use it for an hour..see what happens, its slow, but it does drain.