Listed in Lenovo's official parts lookup for the ThinkPad X1 Nano Gen 3. Lenovo description: "Lenovo BATTERY, 11.61V, 49.5 Wh, 3cell". Parts vary by configuration; match your machine type and original FRU before ordering. OEM parts list only; not bench-tested.
Source notes
Lenovo Parts Lookup (pcsupport.lenovo.com) for ThinkPad X1 Nano Gen 3, machine type(s) 21K1, 21K2, lists FRU 5B11F28682 "Lenovo BATTERY, 11.61V, 49.5 Wh, 3cell". Checked 2026-10-27.