From this link https://www.laptopmain.com/laptop-m-2-ngff-ssd-compatibility-list/ Asus GL553VD comes with a SK hynix HFS256G39TND-N210A 256GB SATA 3 SSD, but the M.2 of GL553VD support PCIe NVMe SSD, the Samsung 960 EVO will compatible with Asus GL5...
From this teardwon guide https://www.laptopmain.com/asus-rog-gl502vt-disassembly/, I found the battery part number is C41N1531 15.2V, 64Wh Li-ion battery.