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Battery Life in Laptops/Their Battery Cells?

Hey all, just a quick question about batteries for laptops and other devices. I have a 12 cell li-ion battery for my notebook, rated at 8400mah and 95wh. Why exactly is the battery capacity at this level, while when I look on ebay I see li-ion rechargeable cells that hold 3400mah 12.6wh each. If I put 12 of those cells into my battery, I would have a 40,800mah 151.2 wh battery. Is such a thing possible, or are the cells way overrated? They're panasonic 18650 cells, the same type in my battery. Is the significantly higher mah rating going to improve the run time, or only the higher watthour rating? 

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