We had our iPad for about 2 years now and have no problems so far with the battery.
Yesterday I went to the Apple Store for some help with my photo's.  I had photo's in Aperture and iPhoto,  I desperately needed help, LOL.  While they were moving my photo's for me they tested my iPhone.  They found out my battery was going bad. Actually, I thought my phone was good as far as the battery.  I think I had the phone for a about a year, but they looked up my warranty and said I was covered.  While replacing the battery they broke the ribbon that held the battery. Since it wasn't fixable they  turned around and gave me a new phone.  I say that's great customer service.