Just read today in the Digital Life where somebody complained that the laptop CMOS battery ran out in less than 3 months. Why? I can guess. That person might have removed the battery from the laptop, and did not keep the laptop plugged into a live socket.
There's a myth going around that removing the battery of the laptop will extend the battery life. That might be true for laptops built before 2000, but for current laptops, you should not. Every laptop has a small battery internally. This battery stores all the information of your laptop, like what's your BIOS password, what harddisk type you have, etc etc. With the laptop battery in, the laptop will use the laptop battery's power to keep this information intact, otherwise, it will use the small little battery in your laptop. The laptop battery will also "re-charge" the small little battery. Remove the battery and remove the power socket, I think you can guess what will happen to that tiny weeny battery inside your laptop.
I have posted about this a few months back. You can read about the misconceptions of lithium-ion batteries here. In case you do not know, the laptop battery is also known as the lithium-ion battery. It's the same type as your handphone battery.
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