for those of you who choose to go with the 3-cell-battery to have access to the second m2 slot note that in case you populate BOTH slots with NVME-SSDs you will have EACH of them be pcie-3.0 by 2x instead of 4x (which the faster NVME-SSDs do support).
in short you will be limiting each NVME-SSD’s speed by half (but NOT the access times - at least i don’t believe that to be the case)
is that correct @MrChromebox ?