Dear Vignesh, I just found a work around to prevent rapid discharge of the battery due to the brightness setting. When the charge on the PB comes below 55 percent, the LED turns to yellow. Just take the Playbook out in the sun and make sure the sun rays are focused on the light sensor/LED on the playbook and you would then have control of the brilliance for the duration when the rays are focused. Adjust the brightness to the least possible to prevent fast draining of the battery. The option of updating the software with the new BB Link application is also available. I have tried it a couple of times with no success. You may also try the same. It might work. Please try the above and leave comments.