Left the apartment with a fully charged Samsung S7 edge in my backpack. Twenty minutes later I opened it to find my battery at 83%. Battery usage in settings showed Digits at the top of the list. Done with my short test of T-Mobiles Digits as it seems it's not ready for prime time. Hopefully, T-Mobile will let us know when they fix it. If I hadn't looked at my phone for half the day, which is normal for me, the thing would have been stone dead.