I'm not questioning whether cylindrical cells used to be popular for laptops; they were an iconic part of old ThinkPads. But I've opened up plenty of chunky gaming laptops in recent years from Asus, Dell/Alienware, MSI, Razer and have seen nothing but LiPo batteries. I think cylindrical cells may have genuinely disappeared from the laptop market at this point, unless they're still around in some niche that's significantly more obscure than big heavy gaming laptops. Most laptops these days that opt for a thick enclosure are doing it for the sake of the cooling system, not for the sake of fitting in a thick battery.

Edit: I looked at the Gigabyte A5 and agree that it's probably using cylindrical cells. It appears to be a Clevo system, so there were probably other brands reselling as well. But it's not quite a current model (3 year old processor), and the reviews seem to agree that the battery is one of the worst things about the machine, because the capacity is way too small for that class of machine.