The Samsung Galaxy S5 was my favorite phone ever, mainly due to the removable battery. If I were out all day and running low on power, I just grabbed a spare from my bag, and I was back to 100% in 30 seconds. But that’s a thing of the past on the Galaxy S line, along with most other flagships. Getting a new battery for most modern smartphones involves sending it to specialists or using your own hotshot engineering skills.
While I’m not convinced, manufacturers will tell you non-removable batteries are better. It’s partly about water and dust resistance, partly about building a sleeker device, and partly about performance and safety. Sealed batteries allow for larger capacities in tighter spaces and reduce the risk of user error. But it’s also made it harder to do basic upkeep when your battery inevitably declines.