Thanks for the report. We would encourage not to put the battery and WiFi signal icons on the screen for the reasons:
- The reason you specify above,
- As it will use up a lot more battery power as it will do a lot more screen refreshes.
- Signal and Wifi are available in the settings page
There are workarounds to this:
- Or listen to the shell events onSignalLost, onSignalRestored and onLowBattery. Hopefully these will negate the need for indicators and they are less battery intensive than using battery and signal events as they don't poll for data.
I have created a bug report for the default indicators regarding needless updates, but unfortunately the fix wont be available for a while.