There's actually a reason for Duracell.
Batteries don't produce current (amps, amperage, etc), but voltage. As it turns out, Duracell batteries happen to have a low leak voltage (volts, electric potential,etc). Leak voltage happens because we don't live in a perfect world, and batteries have internal resistance (ohms, unit, etc). This affects shelf life, and longevity of systems running LPM.
However, because Duracell batteries have such a low leak voltage, systems can run in LPM (Low Power Mode) and stored for much longer.
As for the alkaline factor, those basically tend to have a greater constant voltage. Think of it like a gas tank, the alkaline batteries just have a bigger tank than the other varieties, which we call heavy duty.
Sorry, I'm an electrical engineering student, this is my jam. Don't get me started on the misconception of electron flow.