Answer to: Correct battery clibration after replacementApple no longer recommends “calibrating” batteries on Unibody MBs or newer. The batteries are smarter now.
Answer to: SSD problem can't formatI had an Apple-label Samsung SSD in a Mini go bad -- it could be read, sort of, but many disk operations were unsuccessful, and formatting it just crashed. So I replaced it. But eventually I was able to revive the Samsung by connecting it directly to SATA in a PC and formatting it as a Windows drive using a freebie Wintel disk formatter. Then I was able to use a USB case to connect the SSD to a Mac and format it as APFS.