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Slow SSD performance on battery, returns to normal while plugged in (A515-43)

Hi,
I noticed something very annoying while testing the Intel 660p nvme SSD on my Acer Aspire 5 A515-43-R6WW.
On battery, with all power saving options disabled and everything set to "Maximum" or "Best Performance" whenever possible, I get about 400MB/s sequential reads and writes instead of 1500+MB/s with the charger. This is unacceptable. I don't want my SSD throttled when I'm on the go, it doesn't use that much power anyway.
If anyone knows a fix to make the SSD run at max speeds at all times, I'd highly appreciate it.

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