Thanks for your concern - having deleted the two items in Device Manager under "Battery", 
and allowed them to be re-discovered and re-installed at re-boot, "Microsoft Composite 
Battery" has magically reappeared in Device Manager under "System": it is the intermediary 
between the battery and various system functions of which the battery state-of-charge 
icon is one.

I can't find any reference to how or why this works, but it seems that "Microsoft 
Composite Battery" cannot be installed directly, its a side effect of the other items 
being installed. Very strange, and no wonder there are so many Google references 
to struggling with it. 

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