Dear Samsung Member,
Greetings from Samsung Customer Support!
To avoid battery drainage please turn off un-used options, decrease display brightness, turn off auto sync option, close background running apps.
Follow the troubleshooting steps provided in the given link to resolve battrey drainage problem: http://www.samsung.com/in/support/skp/faq/1101689
- Kindly follow these below mentioned troubleshooting steps to resolve camera issue:-
1) Reset camera settings: Click Camera > Go to Camera Settings > Reset Settings.
2) Clear camera app data: Go to Settings > Apps > Camera > Select Storage > Clear Data and click OK.
If issue still persist or for further assistance, kindly register your concern in Samsung members app (Samsung Member > Get help > send feedback > Ask question/Error report)
Thank you for writing to Samsung.
Samsung Customer Support