So you sent it in to Apple to replace battery?Could you reveal the cost?
Bear in mind that this has only happened with the Classic, not the Touch. Anyway, as it was still under warranty (and I always, always, keep the sales receipt for such contingencies) Apple took care of it.
Twice I received a replacement iPod - this was back in 2006 and the iPod in each case was a 30GB Classic; a small, but significant percentage of them seem to have some sort of issue regarding battery life - one of mine lasted barely six weeks. All of my iPods that expired and were replaced were Classics, and were still under warranty at the time they - or their batteries - died. Actually, this excellent service, and that fact that Apple immediately honoured warranties without seeking refuge in contractual small-print, were one of the main reasons that I "switched" to Apple computers in 2008.
Later, in 2008, I got a 80GB Classic which still works perfectly well. To add to it, in summer 2009, I bought a 120GB and that, astonishingly, died after a few months. When I was next home on leave - I was working in the Caucasus at the time - I brought it back to where I had purchased it complete with sales receipt. On the spot I was offered a refund or a replacement; it wasn't considered possible to repair it. I opted for a replacement, but the store didn't have any 120GB Classics in stock, and were not expecting a consignment for a further week. As I was due to fly back to the Caucasus the following day, I asked about the Touch. There was a price difference between the cost of the Classic and that of the 64GB Touch which I was happy to pay. Prior to that, I had considered the iTouch to be a triumph of marketing and "hype" and had been more than happy with the Classic as I only wished to have my entire music collection with me. However, I have to say that it is a superb iPod and I have been very impressed with it.
In essence, I think that the SSD battery of the Touch (and Nano) is a lot more stable and durable than the old HD style battery of the iPod Classic and indeed, the older computers.
These days, I have a MBA (I used to have a MBP) and also, have been very impressed with it, to the extent that it has become my sole computer.
Hope this is of some assistance.
Cheers