There is no removable battery in an iPhone 5s
However you may even if you believe the phone is disabled be able to hold down the on/off button at top right of the phone and the large center App button on bottom together and hold them down until the white apple logo appears on the screen. Then release both and see if the device resets.
For further suggestions. If under warranty go into any apple store world wide and they will take care of you.
Thanks! Still working on it.