Companion patch to D23270
The same logic explained in D23270 applies here: using the text "Capacity degradation"
is much clearer than "capacity" when referring to how much of the battery's original
capacity is remaining due to degradation.
I think this needs some explanatory context
+1, same reasoning as in D23270#514978.
I disagree with this change, see D23270#515102
Use the superior agreed-upon string "Capacity degradation"