The battery shops I mentioned haven't had any issues with fakes. People have been using them on BLF and CPF for years. As a more general matter, fake batteries don't seem to be as rampant now as they were a couple years ago, though I'm sure they still exist.

UI of course is a matter of preference and I haven't personally tried the PB40.

Do you have a link to the USB-C cradle? I'd like to find out more about it.