@binboupan @tmpod I’d say it’s simply space. To make modern smartphones have enough power for the day, the battery has to be as large as possible. Generally, it’s sandwiched directly between the screen and the backcover.

The reason they’re not removeable anymore is because this way manufacturers don’t need to put the battery in a plastic casing, leaving more space for energy.

I mean, you could also just make the smartphones bigger, but people want them as flat as possible.