I bought two extra batteries thinking that I must have an old or bad battery but I am still disappointed with the batter life that I am getting. The 2 that I bought are supposedly new. When I watch a video clip for 45 mins, the battery indicator drops down to red (low battery indicator comes on. Am I expecting too much from the battery or is that somewhat normal? I am using headphones on Media Player with volume at about 30% and brightness at 3/5 bars with it in offline mode and no other apps running.