Perhaps more modern ones, but the ones in my last and current laptops are both 18650s. 6 cells, 9 cells, you stack in series to increase voltage, parallel to get more capacity, so a 3s2p would have ~14V which is more than the required 12V for internal components, no boost converters needed. That said, now they do a lot of pouch batteries which are actually multiple internal pouches run in series to get the same sort of voltage but made with the chassis fitting them perfectly, no wasted space.
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