If you actually want to find a file on a long abandoned laptop, it may be easier to pull the drive and use an external enclosure to read it with a current system. If you have the hardware. No need for any of the other hardware, rtc, nvram, let alone the os to work.
If you are just checking one or two devices, charger is the way to go. Now if you need to check like a dozen for some reason, pulling the drives might be easier.
If you actually want to find a file on a long abandoned laptop, it may be easier to pull the drive and use an external enclosure to read it with a current system. If you have the hardware. No need for any of the other hardware, rtc, nvram, let alone the os to work.
Really? Pull a drive instead of plugging in the charger?
If you are just checking one or two devices, charger is the way to go. Now if you need to check like a dozen for some reason, pulling the drives might be easier.