Thanks for posting in the Apple Support Communities emrecio,
We understand you want to conserve battery on your iPad touch, do it lasts as long as possible on a charge. You can make your iPad lock and turn it's display off, by enabling Auto-Lock if it's not already. Setting a shorter duration before it locks may also help. To do that, tap Settings > Display & Brightness > Auto-Lock.
You can also reduce activity that impacts battery life by enabling Low Power Mode. Additional information about this feature is available, here: Use Low Power Mode to save battery life on your iPhone
Finally, the following page is a great source of tips and guidance to help adjust setting on your device to improve battery life, and get the most out of a charge: Maximizing Battery Life and Lifespan
We hope this helps!