theres some setting you can go to to check the battery strength.. thanks!
Battery Check and Contrast Set Up: Press [2nd] and the up or down blue arrow keys to darken or lighten the screen contrast. While doing this you will notice numbers in the upper right hand corner of the screen counting up or down depending on which arrow you press. These numbers indicate your battery strength. Adjust the screen to the correct contrast and check the number in the upper right hand corner. If the number is 8 or above I advise changing batteries.