Battery life has not been an issue on mine but it has done a couple of wierd things lately. On Friday evening I used it for a while and there was a good amount of charge left in it (can't remember exactly, but it was like above 80%) and I then put it to sleep thinking that I would use it first thing in the morning to look at the news and check mails etc. Next morning when I pressed the power key it flashed up an image showing that the battery was flat and so all thoughts of reading in bed went out the window as I had to recharge it.
This morning I charged it fully and then used it for a few minutes to check mails and look at the news before coming into work (also I did a quick flick through with Alt+Tab to check that I hadn't left any programs or apps running and then put it to sleep). About two hours later I was in work and I reached into my bag to get something and I could feel heat coming off it as if it was playing a video or running a game. I took it out and it was definitely quite warm as if some process was running - but again, none of the programs were open but now the battery is down to 80% which shows that something had been going on. It doesn't usually go down like that on a full charge whilst in sleep mode. So, am I going to have to turn it off every time I finish with it, even if I think that I am likely to come back in an hour or two to check emails or something like that?
It is also still doing this thing where I had to do a hard restart once every couple of weeks or so. Does this sound like a problem with the unit? If it wasn't for annoying issues like this I would absolutely love this thing, I take it with me everywhere now but for the price I paid, I would like to see a bit more reliability. Not a flat battery or a dead screen and messing about with holding the volume and power keys down.