Can never using a laptop’s battery harm the hard drive? [closed]

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I have always used power connection with my laptop.
Recently the hard disk was damaged, the tech replaced it and said, not using the battery can damage the hard disk, is this correct?


Could it be that he said never using the battery will damage the battery? Because that’s actually true; the best way to preserve the running life of modern lithium-ion batteries is not to keep them charged up all the time, but rather to discharge them almost completely and then recharge them to full in one go (i.e., without unplugging at half full and running it down again from there, &c.)

It is completely nonsense. You cannot damage your hard drive not running on batteries. End of story.

Despite what everyone else here said (and I first thought) He might be technically correct.

Assuming its a hardware fault –

The battery can act as a power regulator, and thus help protect the hard drive, particularly if the power is unstable. In reality though, a hard drive should not be affected by the absence of a battery, and hard drives are expected to fail at some point as they have moving parts.

A systems power supply SHOULD regulate well enough to ensure a hard drive is never damaged.

In other words, while it may be correct for a tech to say “its not best practice” to run a laptop without a battery, it is incorrect to blame damage on the lack of a battery.

Assuming its a software fault –

Yes, the tech is correct – if the drive is writing and the power is disconnected it can cause file system problems, which can be described as damage. (There are filesystems that try very hard to prevent this problem [journaling file systems], so it is a real threat.)

Assuming he meant physical damage, then its utter nonsense. What about the millions, perhaps billions of desktops and servers that run without a battery? The technology from the board to the drives are same.

The data could be damaged, not written properly, or lost. That does not warrant a new hard drive though.

The only circumstance I can come to would be brown=out conditions or spikes where the hardware is constantly going over or under current. This can harm not only the hard drive, but the entire desktop, laptop, or server. Which is part of the reason you use a surge protector or UPS whenever possible for all electronics. If you are behind one of these devices than battery or not makes no difference as far as physical damage.

An update, after some more digging I found this

It seems the sales channels teach “Leave the battery in at all times” possibly to help sell more batteries in the long run. But the tech manuals go more this direction:

“Do not keep a notebook plugged in with its batteries in place at all times. This will cause the battery to lose its calibration and ability to charge correctly.”

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