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Laptops continue to run off the battery when plugged in, they are just charging at the same time. Leaving your laptop plugged in all the time, while practical, is not ideal for battery life. In the end, the objective is to have the battery remain functional as long as the device does. For most devices, this is relatively easy with minimal effort. For me, this is not so easy with laptops, and batteries need to be replaced every 18-24 months. But I probably use laptops more than the average person.
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