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What is the model?

It's better to check from a customer service center.

Take look what kind of app eating your battery..plz go to power section and check the problem your self..or plz install accubattery then let the app chek...may be you will find the problem

When you use features or apps that require more power or use them for extended periods, your device may temporarily Heat up due to increased battery consumption. Close any running apps and do not use the device for a while.
Try these steps
• Turn off Wi-fi, GPS , bluetooth and other connectivity options when not in use
• Decrease screen brightness
• Close applications when they are not in use by using the recent application button.
• Too many 3rd party applications installed in device may result in device heating since their corresponding process will keep on running in background. So I'm advising you to uninstall un-necessary apps if not using them.
• Aslo do not use device while charging as it may cause the device to over heat.
• If still issue occurs backup your data & reset the phone

Suggest you try safe mode......from 100% to down.....check whether it's the same!
If not issue with device itself.....and if you have warranty go for it