Question: My nephew has a 2018 OMEN HP laptop and just recently received a hard drive error. I replaced his battery that was looked like it was about to explode after opening it up to see what was wrong.
He has one SSD and a small M.2 ssd card I have never used before. I think I need to change that card but am not 100% sure.

This is the message i got and after doing a systems check the hard drive smart check failed:

The SMART hard disk check has detected an imminent failure. To ensure not data loss, please backup the content immediately and run the hard disk test in system diagnostics

Failure ID: 9TWDXX-8T7A6E-MFPUQK-60FX03
hard drive slot 2

(usually shown at top of report screen).
It says drive 2 which would be the standard ssd
i tried to change both that and the ram size M.2 SSD

Samsung SM961 Polaris 128GB M.2-2280 PCI-e 3.0 x 4 NVMe Solid State Drive SSD

I purchased a

Samsung 970 EVO Plus SSD 250GB – M.2 NVMe Interface Internal Solid State Drive with V-NAND Technology (MZ-V7S250B/AM)

to replace it and a case so i can clone the drive 1 but he still gets the message. I also tried to take out the drive 2 ssd which is storing his games and such and he still gets the message. Last week i tried to do a wipe on the drives and nothing changed.

Answer:Found the problem. I had not unplugged/disconnected the drive used for storage. I replaced it and it solved the issue.