There are laptop batteries that can last up to 22 hours like that of a new M3 MacBook Pro, while a few, such as the Panasonic Toughbook 40, could give you 27 hours, according to PC Magazine. On the other hand, some other laptops can’t seem to stay on without being plugged in. This huge discrepancy between batteries across laptops is due to several variables, but there are two general ways to classify them: battery life and battery health.
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