Apple and Samsung are the two major smartphone players with long history. The evolution of battery size of their phone models also tells us the evolution of battery technologies over the years.

The following image shows that the battery size of iPhone is gradually increased over the years, but not substantially. The big change of battery size between 2017 model and 2018 model reflects the screen size change of iPhone from 4.7 inch to 6.1 inch.

As for Samsung, the rapid battery size increase between 2010 and 2014 was mainly due to the screen size increase, similarly for the years between 2018 and 2020.

If we look at the the iPhone 2021 and 2022 models with 6.1 inch screen and the Galaxy 2022 and 2023 models also with 6.1 inch screen, the battery sizes are very similar. It seems that the competition of battery technologies between these two rivals will continue.

(Note: All the data are either from Wikipedia or GSMArena.)