To resolve the above mentioned issues please follow below steps:
For Battery drainage: http://www.samsung.com/in/support/skp/faq/1101689
For camera issue: Set the high camera resolution ( Open camera> Setting> Camera resolution)>Reset the camera ( Open camera> Setting> Camera setting>Reset)
Regarding battery time indicator feature we have noted down the feedback.
We appreciate your valuable comments as this would assist us to improve our services.Will convey the relevant update as soon as possible.
Regards,Team Samsung Members