Is anyone else experiencing very heavy battery usage by this app when not in use? After the latest uodate this app is sucking on 15-20% of my battery without even touching my drone, contacted dji support and they are clueless.

Could you please clarify what mobile device you are using?

In addition, have you tried to reboot your phone and please make sure it does not continue to run as a background application.
I checked on my phone, if i do not run the APP, it will not eat my battery usage.