The One's battery life really is amazing, I normally used to struggle with a journey from my house to the west of London then back again with a lot of use. I had one of the longest days ever yesterday, train at 6:30 with TuneIn until I got to the tube, then Beyondpod on the tube, emails/texts/web on and off all day then the same Beyondpod and TuneIn on the way home. I was still around 20% battery when normally I'd have had to turn other phones off for less use than that or carry around a spare battery.
With normal use I'm easily getting a couple of days out of it.
With normal use I'm easily getting a couple of days out of it.