pnichols ABSOLUTELY!
When manipulated correctly Trends & Tendencies is worth it's weight in gold. I use an amp hour meter for single cycle charge or discharge accumulations where error is reduced to near zero (No Peukert factorials). This is helpful when simultaneous charge and discharge (robbing from the charge rate) is occurring.
One of the reasons my abstract brain function at age 69 is equal or better than it was at age 40 is because I exercise it. There is no better exercise than functional mental exercise in which math is useful - relevant. Abstract functioning deduction of Trends & Tendencies is a boxing match grade mental exercise. If a mistake is discovered in deduction, it's like a left hook to the chin. It is painful. or at least it should be.
Boiling down and distilling observations to piece-of-cake battery management effort is the reward. It becomes intuitive. This leaves 23 hours and 56 minutes per day to pursue other activities.