Laptop being thinner is a trade off you're willing to make, I am not.
Charging a battery with another battery is extremely inefficient.
Lugging around laptop batteries is exactly the same thing as lugging around power banks, except laptop batteries don't require a dongle and a cable to tether you to a table.
Laptop batteries mean you laptop can continue to in fact work from your lap.
Laptop being thinner is a trade off you're willing to make, I am not.
Charging a battery with another battery is extremely inefficient.
Lugging around laptop batteries is exactly the same thing as lugging around power banks, except laptop batteries don't require a dongle and a cable to tether you to a table.
Laptop batteries mean you laptop can continue to in fact work from your lap.