if you buy new nvme's ssd just look at power consumption specs
For example:
INTEL 760p Series SSDPEKKW010T8X1
Power usage: 0.01 watt
Standby usage 0.005 watt
SAMSUNG 960 EVO MZ-V6E1T0BW
Power usage: 5.7 watt
Standby usage: 1.2 watt
and who would have thought why samsung i so drainin' battery...
Those numbers only apply when LPM or APST are in effect. You have to read the reviews to see what the actual power consumption when LPM not active. From what I have seen so far, only MydigitalSSD is the lowest since it uses only x2 PCIe link, everything else will cause your battery life to take a noticeable hit.