But most consumers probably don't care about the internal pack voltages or whatever, all of that is just implementation details. All they care about is how much

But most consumers probably don't care about the internal pack voltages or whatever, all of that is just implementation details. All they care about is how much more time that battery is going to give their device power. Which if they know how many watts their device uses and how many watthours their battery is good for, they'll roughly know the answer. For a lot of people, all they really need to know is the watts and watthours. Everything else will just line up in the implementation. If I know my phone uses ~1W on average, and my battery is 18Wh, then I know I'll get roughly 18 hours of life on that battery. If I want to charge the 18Wh battery in two hours, I'll need one that can supply at least 10W after charging losses.