Apple

Battery tech has the limitations of chemistry to deal with. A ton of cutting-edge work is being done with exotic materials, but it needs to be ready for the mass market before we see any groundbreaking improvements.

Not every other kind of technology though. I think the problem is that batteries get lumped in the same category as "modern tech" (e.g., microchips and storage), rather than with energy tech.

For example, Wikipedia says a post-war VW bug got around 35mpg. That's similar to the combined mileage of a Civic that's 50 years newer. Yes, the Civic is more powerful and weighs more

but we're not talking Moore's law improvements.

Same if you look at power. A 1967 Corvette 427 was listed at 430 horsepower; a modern base Vette is 490 (or 670 for the Z06). Sure, the mileage is way better, etc., but again, hardly Moore's law improvements.

Energy and power are tricky.

I mean sure, but it’s also kind of the opposite. Energy density has increased dramatically from lead acid technologies.

The real issue is you’re not going to leave leftover power untapped, so the tech will always exceed the battery as they try to leech every last drop of power from the system.

Sorta like an energy chicken and an egg situation.

More like Apple is slow to advance their battery size. Samsung is offering like, 5000mAh batteries in their A series phones (Hyperbole yes, but still)