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Since laptops are equipped with a battery anyway, they lack of a coin cell (mostly a CR2032 cell) to keep track of time. This means that your laptop will not be able to estimate the correct time and date when powered with energy outside of the original battery, and these settings have to be made manually each time your laptop will be used.
It will work fine without the correct time set, but you might have issues with files that are created "in the future" (from your laptops perspective).
I have an old laptop (still in use occasionally, because I have a scanner that is too old to be operated with current software) where I replaced its battery once. The sign the battery was dead was that the OS issued a warning the laptop was not able to tell the correct time.
A lot of laptops still have a coin cell
Really? My laptop doesn't. Maybe it depends on if the battery is designed to be removed by customer or if it is hidden inside the laptop, making it accessible only with tools.
that's more likely the deciding factor yeah
that and whether or not you're me. I always seem to have the bad luck that whatever model want to buy doesn't have a coin cell lol
Actually even a lot of laptops with non easily removable laptops still have coin cells. My work requires me to sometimes to repairs and I’m surprised by how common it still is
I was surprised to stumble across a BIOS battery yesterday when I was taking out the drives to copy out some data, so I guess that aspect of it all is OK.