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Sep 20, 2016 4:34 PM in response to Saswata2014by Lindsay_B.,Hi Saswata2014!
Thanks for using the Apple Support Communities. After reviewing your post, I understand that you have some concerns over your battery life, specifically which apps are using more of its percentage. Your screenshot shows the Camera app using 31% in the last 24 hours, though you haven't used it at all in that time frame. I rely on my iPhone, and closely monitor my own battery usage to make sure it lasts when I need it. I'd be happy to help make sure yours does, too!
I've got a few ideas to troubleshoot. Before getting started, please make a backup of your iPhone following the instructions here: How to back up your iPhone, iPad, or iPod touch
Once the backup is created, try the following steps in order. Test after each step by using the iPhone, then checking the battery usage. Since the battery usage is assessed over time, you may not see any changes unless you test for a at least 24 hours. Once the issue is resolved, you do not need to continue with the steps.- Quit any open apps, as detailed here: Force an app to close on your iPhone, iPad, or iPod touch
Then, restart the iPhone, following the steps here: Restart your iPhone, iPad, or iPod touch
- Reset the settings on your iPhone under Settings > General > Reset > Reset All Settings.
This will not remove any of your personal data (contacts, photos, Calendar events, etc) but will revert customizable settings (wallpaper and screen brightness, alert sounds and ringtones, Date & Time settings) back to their factory defaults. It will also remove any saved Wi-Fi networks and passwords, as well as any previously used APN or VPN settings.
- Restore your iPhone to factory settings, using this article: Use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod touch to factory defaults
Once the restore is complete, set up your iPhone as a new device (meaning without your backup, at least temporarily). You can sign into iCloud, iMessage, FaceTime, and the iTunes and App Store.
If your battery usage is OK after setting the iPhone up as a new device, restore your backup as instructed here: Restore your iPhone, iPad, or iPod touch from a backup
I would also suggest checking out the General Performance and iOS tips at the following website as an overall way to help make sure you're getting the most out of every charge: Maximizing Battery Life and Lifespan
Have a great day! - Quit any open apps, as detailed here: Force an app to close on your iPhone, iPad, or iPod touch

