I have original Ipad and IPad3. Original takes approx 3 hours to charge from 10% remaining and once charged can be used all day and only drops down to approx 25% - 30%
The IPad3 on average is taking between 14 - 16 hours to charge and only has a life of approx 3 hours max.
I make sure that there are no apps running in background. I am using the correct 10V charger and cable
I would be interested to hear if anyone else has this problem.
I have been in touch with Apple but the person dealing with me is on hols for a few days