a) Either by upgrading to Big Sur (or in Catalina, Mojave the latest security updates) with your original SSD inside
* this has no effect on battery drain
b) Upgrading Boot ROM Version without upgrading to Big Sur
* this also has 0 effect on battery drain
2) ***Install tools which significantly lower the idle wattage for 3rd party SSDs***
a) SsdPmEnabler
b) NVMeFix plugin inside lilu
c) a+b combined reach an even lower wattage in most cases
* these steps significantly increase the performance of the ssd and reduce the power consumption in the os but it does not fix the sleep / hibernate issue.
Maybe we should try different adapters, different ssd manufacturers ? Or only original Apple SSD has the sleep functionality ? this is so stupid ... why apple does this