Had a 64gb 4S since release date. Battery was ok for the first 4 months unpluging it at 8 am, could go on to 11pm and still have around 20-30% which was acceptable for me, although my ex iPhone 4 under the same usage was around 40-50% at that time. Anyway, after the 5.1 update things got worse. Battery was holding until only until 7-8 pm which was at the limit for me but I said I'll keep it since I really enjoy the 64 and 1080p. 5.1.1 actually made it unbearable for me and at 1 PM I am at 50% and I don't even game, just text browsing, whatsapp and mail. Ocasional YouTube but no more than 40 minutes a day. Luckily, got my phone exchanged with Apple Care and it came out with 5.1 and thought to keep it for a couple days that way. Very slightly better, but still not satisfied. Today updated to 5.1.1 and again it's *********. I feel like on a 2010 Android phone. I miss the days of the i4 with 4.3.3 when I was loosing 2% over night at most and could hold the phone for 2 days. Besides, I do not know for how long I will be able to find an sealed 32gb iPhone 4. These are already pretty rare it seems. Before my first iPhone (the 4th) I had a Nokia E71 for 2.5 years because it had great battery and it just worked (in Symbian standards anyway). I loved the 4 because it did just that, only million times better. How is your 4S battery ? Be honest.