If you have the BlackBerry Bold 9930 or Torch 9850, is is extremely important to update to 7.1 software. (Read this post to learn how to update using BlackBerry Desktop Software.)
There is a BlackBerry power bug in the 7.0 software on the newest Torch 9850 and Bold 9930 that you will see when your device drops below 10% of battery, then charged overnight, the device will die and not turn on again. This is sad… however, RIM has assured us… there is a fix (to prevent this from happening to your phone.)
Please update to the 7.1 software. Please make sure you have downloaded BlackBerry Desktop software and back up the device before updating it.
To read more about this BlackBerry Bug click here