Wow. Well I guess I must be lucky, because mine lasted 8 hours. I bought my nokia brand new too. So perhaps yours was a dud? I could watch movies for 8 hours no problem. usually it was just over or just under 8 hours. I always brought my charger to plug it in after the 8 hour period was up. I kept the screen display at around 50% brightness. It could also be due to the fact you were streaming youtube videos. And mine was from the card. But I always had wifi on and was on pidgin in IRC, AIM, etc. Usually browsed here and there as well. I wouldn't get a nokia battery either. I'm shooting for the mugen (sp?) when i get the n810.