Don't worry, it won't drain the battery
How to Enable or Disable the Touchscreen on Your Chromebook
Is your Chromebook’s touchscreen not working properly or not working properly? Do your kids often play with your Chromebook’s touchscreen and mess up files and system settings? Disabling your touchscreen can solve these issues.
This tutorial highlights the steps to disable and enable touchscreen functionality on Chromebooks. Make sure you have an alternative input device (touchpad or external mouse) before disabling your Chromebook's touchscreen.
There is no option to disable your Chromebook's touchscreen in the ChromeOS settings menu. To disable touch input in ChromeOS, you must first enable the Chrome Flag for debugging keyboard shortcuts.