At the time I had an HTC TyTN 2 phone that did everything the iPhone could do and more, and had a removable battery, about the same size as the battery inside the iPhone 1. If you look at photos of the TyTN 2 battery, and the iPhone 1 battery, they are very close to the same size.
There was very little difference between those batteries. The TyTN 2 had a 1350mA hour lithium battery. The iPhone 1 had a 1400mA hour lithium battery. Practically no difference there in size or capacity.
So, no, the iPhone's battery was not a "technical marvel" any more than other phones of that era.
And in fact Apple's was a step back by being non-removable. I absolutely loved having a removable battery, because I could bring 2 or 3 with me on a long trip and never have to charge the phone. Apple was less functional in that way.
> "The iPhone "couldn’t do what [Apple was] demonstrating without an insanely power hungry processor, it must have terrible battery life," Shacknews poster Kentor heard from his former colleagues of the time. "Imagine their surprise [at RIM] when they disassembled an iPhone for the first time and found that the phone was battery with a tiny logic board strapped to it."
https://www.redmondpie.com/blackberry-maker-rim-thought-appl...