Today I gave it a proper work out. I fully charged it this morning and then there was a firmware update which I applied. I travelled on public transport a few times and listened to my music and also played some games for a good hour and a half. I have sent a few texts and had a conversation on the phone. I have also used it for web browsing and checking an amazon delivery. I wrote a shopping list with the S pen after realising I had no paper, then realising I had a notepad built into my phone. I took a number of photos of the cats, using the zoom functionality, I took some photos of a load of birds in a tree. All in all a fairly heavy use for me and if I had been using the S20U, the battery would have died. I still have 34% left. I am quite happy with that.