Because they have tiny batteries because they have massive room dedicated for the GPU, CPU, their cooling and the ability to swap out more components than any of the Mac options do, often including adding more than 1 drive. On huge devices like that a battery is more of a "battery backup" than a power source.Apple is closer to the truth than PC...i never got those claims...not in my surface or dell laptops
Light usage always was around 60% of the claims, while in heavy duty close to 2 hours
Light usage on M1 SoC i always got around 80-90% from that claim in light usage and around 4 hours on heavy duty
I saw an big Alienware that can also be treated as a desktop thanks to the weight and dimensions that never reach more than 1 hour and a half of heavy duty...
PC manufactures cannot do more since the dGpu are more hungry and the battery inside for most laptops tops 100-watt-hour lithium-polymer battery
There is a reason that machine is referred to as a "desktop replacement"
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