When your BlackBerry's battery level gets low, the phone's LED light begins flashing. If you do not charge your BlackBerry at this point, the battery level gets depletes until the BlackBerry cannot make or receive calls or texts shortly before it turns off completely. If your BlackBerry's battery is dead, charging it may be confusing. The phone does not turn back on immediately, leaving you to wonder if it is charging at all.
Plug your BlackBerry power cord into your BlackBerry, ensuring it fits snugly. Plug the other end into a power source.
Monitor the BlackBerry's LED light. It should turn yellow and flash slowly. This flash should be the same colour as it was when your BlackBerry's battery was low, but the flashes should be significantly slower.
Wait for 10 to 15 minutes, then try to turn on your BlackBerry. If it does not turn on, wait another 10 to 15 minutes and try again. Leave the BlackBerry plugged in during this process. Once the BlackBerry is on, you can observe its battery level as it charges.