The newer ones (13's?) show the %. The older EVIC style just tell you when it needs changed. If you change it early, or when do you have to reset it by doing the following.
1. Without pressing brake pedal, push start button and cycle it to the ON/RUN position, do not start the vehicle.
2. Fully depress the gas pedal slowly three times within 10 seconds.
3. Without pressing the brake pedal, press the start button one more time to cycle it off.
There is a Drive Dodge app and a Durango app that are pretty good. I can not find the Durango app anymore on the playstore, but it shows up in my history and I have been able to download it on new devices. It is a shame because it was a 2011 Durango app that has more complete and better info that when you pick Durango from the Drive Dodge app.