Many low-end laptops come with 6-cell li-on batteries with a life of 2 - 3 hours.

Does anyone know if it is possible to swap out the lesser 6-cell and put in a better one with a longer life?
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the only way you can do that is if you buy a bigger capacity battery from the manufacturer, OR the much more difficult way is to take apart your battery and replace the li-Ion cells inside with higher capacity cells. This requires that you understand where things are wired etc...check on youtube for examples.
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And not all makers provide larger battery options for all of their laptop models.

Not sure I would want to try and mod my own battery to make to last longer. High risks of explosions or fire if you get it wrong.
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Indeed there is, it's really a problem They should make it easy to upgrade your battery,that is one part of the laptop that easily gets run down!
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