Is there any way to turn off the phone screen while using the OM4, to save battery, for longer timelapses?

Hello, AlixJS. Thank you for reaching out. Regretfully, there's no option to turn off the phone screen while using the DJI OM 4. I will take it as a suggestion of yours and will forward this information to the designated DJI department for attention. All significant suggestions will be implemented after the evaluation of our relevant team. For the latest DJI OM 4 and DJI Mimo application updates please stay tuned to our DJI official website at ( www.dji.com ). Thank you for your kind understanding.