One might say that the original fault was to include a battery that was somewhat too small, so that after a bit of normal wear, the battery was no longer able t

One might say that the original fault was to include a battery that was somewhat too small, so that after a bit of normal wear, the battery was no longer able to provide the voltage required for demanding situations (e.g., launching the Camera app). Fortunately, they learned from that mistake and started to make iPhone batteries significantly more powerful. As a nice side effect, even a two-year old iPhone XR, for instance, still has excellent battery life today.