I bought my wife a 64GB 4th gen iPod touch, and after a full night on charge from the power outlet, I went to work in the morning. Upon my return that evening, the battery was so low that I had to recharge it just to get it turned on.
I returned that iPod to the Apple store on Saturday, and the replacement is equally bad. I have tried to test it by removing all the apps, switching email to manual fetch, and turning wifi off. This was the last straw, as we shouldn't have to adjust settings to make a product work as described.
This will also be going back to the store on saturday, for a refund, and not an exchange!