Iphone 4s battery drains without me using it?

My phone was done charging & I took it off the charger. I leave my phone on the desk amd and come back later and it was on 75%. I did not use it at all. What can be the problem? Also the Wi-Fi button is greyed out.

Turn off location services, sister

Turn off locations services if you don't need it
Turn off push notifications
reduce brightness to the first S
turn off bluetooth

Yes the battery does go down simply cause it is on. That is the case for any battery powered device.

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