Ive got a not particularly old or heavily used ipad 1 I bought about 18 months ago (a freind won it in a competition just before the ipad 2 came out and i bought it off him). A couple of times in the last week the battery just seems to have drained when I had it on lock....... the first time i think i left tvcatchup open and locked it. The second time my plumber was using it to read a pdf and probably didnt lock it, when I came back to it 4-5 hours later the battery was flat as a pancake (i dont have auto lock turned on cus it messes up tvcatchup airplay). Is this just due to me being a bit rubbish at closing apps, or does it sound like the battery is going? I hope its not going as I wanted a new macbook rather than a new ipad, (ipad comes later), but i might have to re-assess if the battery is shot. Is there a way of telling?