Acceptable Battery Replacement on Amazon?

There should be nothing wrong with that battery - I've used CS batteries many times with no issues.

Just note that this battery requires soldering, and be prepared for that.

The seller is someone called "GAXIN" and they have a very short duration on Amazon and little feedback. Not sure if you can find some equivalent from a more reputable vendor. Not that I am saying anything bad against GAXIN, they may be a perfectly reputable vendor just getting their start. But until you know, or they've built a good reputation, you simply never know.