It seems like this app has a lot of "baby is trying to walk" issues.

Battery is one huge aspect. I have seen issues & comments here & there, but no explicit issue, summarising the whole battery problem, which is currently really huge in this app.

Battery related Issues

• Feature request - ability to shut off or shutdown #941
• Mobile data usage quite high on android #1515
• Would it be possible to implement real push notifications? #1707

Battery related Statements

• Mobile data usage quite high on android #1515 (comment)

This is a meta issue focusing on battery optimisation, in total.