Thank you, thank you, thank you. After having some problems with my 2nd G. touch I took in to the Apple store whilst it was still under warranty and the gal told me there was an update, which I allowed her to install. After the install, the battery drained in a very short time, now it's out of warranty,so I finally got sick of it and stuck it in a drawer. Since I recently got the iphone I decided to take it to Apple and see if it needed a new battery in order to sell it in good order. Before doing this, I turned it on and the battery lasted less than an hour, so I decided to look around for some ideas and discovered this thread. Wow!! Had no idea there were this many battery problems. Anyway, I took the bull by the horns, did a restore via itunes, and followed your advice, (turned on Airplane mode and WiFi). I have left the touch on for about four hours so far, and the battery still looks to be about 90% charged.
Now I want to keep it!!!! But I think a classic, nano, shuffle, iMac, iPad, iPhone annnnddd a touch is a little like overkill. So far, so good but I will let you know how this pans out after a week or so.
BTW I was very concerned I had actually killed the battery by leaving it for so long without charging it.