I got an old Macbook pro (2017, i5, 13") that has a faulty battery. That shows in two ways:
I get regular problems with booting up. I will refuse to do so, showing me an error code ("apple.com/support 2006F") that apparently is linked to a faulty disk (?).
The system tells me that servicing the battery would be recommended ("The battery's capacity is significantly reduced")
Now, replacing the battery is quite pricey, but still reasonable compared to buying new. Anyhow, as the SSD cant be replaced, "repairing" the SSD would be completely unreasonable.
Running DiskUtility gives you a rough assessment if everything is ok with the disk and/or partition. Looks pretty superficial to me though. (i.e.
diskutil verifyDisk /dev/disk0 will check the partition table and that's about it). The Check doesn't show any errors.
So, my question here is: How to make sure that the SSD is NOT faulty (too), i.e. the investment in a new battery is worth the hassle? In other words: How to run a proper check on the SSD?