Hi The 214 Boss and welcome to EB:
BlackBerrys do not like to be run down to the point of having the radio turn off (I forget if it is 5% or 10% or somewhere in between). There is something in the system that after it runs down you cannot dial anything until a certain % is charged and part of that may be to insure that if you are going to make a call on a minimum charge, that the device isn't going to turn off after dialing and connecting. I do know that once the charge reaches a certain amount I can make calls while plugged in without a problem.
The key is to try to not let the device run down that low and if that may happen due to your schedule or expected lack of proximity to a charging device you should think about purchasing a second battery and keeping it ready.
If you just got the BB you should find that after a week or two the battery life will actually increase a bit. Do keep in mind that the LiIon battery in a BB likes to be kept topped off so if you can, keep it plugged in while at your desk or in the car.
Also look around to see if there are reports of particular power issues with certain OS builds as you may want to upgrade. You should also take a look at our
Tips and Tricks sticky, post #2. Also check to be sure your Bluetooth is off if you aren't using it as that will drain the battery.
I hope you enjoy your time here and that you will visit and post often.
Thanks for registering......