@Student Charlie:
RAM value can be fond and understood:
-by fw routine studies, e.g. a RAM location is called/modified in a known routine (better way)
-by randomic RAM exploration
Anyway, going on with your RAM studies you will see the same RAM values are often repeated more than one in RAM, usually in close offsets (as you found out for Battery Voltage).
Usually they are identical in that moment but
may not be the same in all situations, as they are controlled by different routines.
You can guess which to use only by deep understanding of laying routines or by great testing.
How to use a RAM location?
I've already told you, just look
here