batterychargingipad
My iPad 2 has recently become VERY slow to charge- about 1% every 10 minutes while plugged into my Retina MacBook Pro (my usual charging source). I've tried both USB ports on the rMBP and neither seems faster than the other. I checked the Apple support website and it was said to be a bug in iOS 7, but my iPad was charging fine for a few weeks after I updated. What could be some possible causes of this.
NOTE: the battery drains at a normal rate.
Just to cover the basics, I'd try a restore before taking it to the Apple Store for service. Sounds like hardware though, IMO.
Go to the Apple on your Menu Bar and select "About this Mac". You will get the System Information app. Select System Report. On the left side, under Hardware, select USB, then find all the available outlets. If they are all similar, you may need some hardware diagnosis. If one is significantly less than the others, that is your answer--it just can't pump out enough juice.
Best Answer
The USB on a computer is not as punchy as a 10W Power adapter (2 Amps).
If you want a fast recharge, you should better use a power adapter.