MMR uses battery when I'm not playing!

Depending on your device there are some cases where suspending an app instead of force closing it could use a small amount of battery until the app is properly closed.

If you are unsure if an app or game is still using battery after being suspend we recommend force closing the app and if you are still unsure try restarting your device to ensure that the app is fully closed (and even then some devices may keep a some amount of cache open in the ram after a restart but it should be minimal).