KPI for Mobile app

What KPI(Key Performance Indicators) should we keep in mind while testing a mobile app or what can be the KPIs for a successful mobile app?

KPIs for Apps on mobile devices:

• Application time running without connection to permanent power (battery) (App + device + OS)
• Frequency of connections to server (every 5, 10, 30 minutes)
• Num bytes needeed for App data packet to server.
• storage capacity for app data
• logging capacity before roll over
• time intervall app can fully work whitout connection to server

Unclear if these are KPIs:

• remote updateable (full update, difference update)
• capable to migrate app data persisted with old app version to new one.
• encryption of app data.