The answer then, is that goods like this may not be worthwhile purchases, comparing the environmental impact they cause to the limited (nonexistent?) benefits that they bring to our society.

And who gets to decide “the benefits to society”?

Could you say the same about everything that uses a battery? We could all just be using payphones.

I'd be glad if we all could use mobile phones where we are able to change the battery. There is no way around, batteries are wearing parts. And I know that most phones (and even laptop computers) use small/weird form factors to use the even the last bit of space available, but I'd be glad to do with a little less battery life, if I just could switch batteries.

That still doesn’t help the environment. The batteries can be changed and they still have to be disposed of. Having less battery capacity doesn’t help. In fact, you would need to change them more often.