If I see an icon like this, is my Alta HR officially dead?

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[Debor]

Yes it means it is dead 

[423536271827]

If I see that will it continue to track steps @Debor 

[NellyG]

Who knows, @423536271827 ? Try syncing and see if it is counting. I kind of doubt it though.

Have you tried restarting it a few times? If not, then give that a try. If it doesnt help then it is dying

Restart your Tracker  

[423536271827]

EVen when the dead battery icon came out, it synced sucessfully/