About this replacement
Lenovo Yoga 13W — 15.44V Li-Polymer Replacement Battery (5B11F53996)
This 15.44V, 3150mAh (48.64Wh) Li-Polymer cell replaces the original battery in the Lenovo Yoga 13W 2-in-1 convertible laptop. It fits the Yoga 13W across OEM part numbers 5B11F53996, 5B11F54001, L21C4PG3, L21D4PG3, L21L4PG3, L21M4PG3, SB11F53999, and SB11F54002. Dimensions are 253.20 × 94.50 × 5.40mm — verify your original cell before ordering.
- Yoga 13W battery platform: The Yoga 13W uses a single flat Li-Polymer pack spanning the full chassis width. All OEM part numbers above share the same 15.44V four-cell configuration, the same physical connector, and the same BMS handshake protocol — which is why Lenovo issued multiple part numbers across production runs without changing the underlying cell spec.
- Bench tested on actual hardware: We ran this cell on a Yoga 13W unit and confirmed the BMS initialised cleanly on first boot. The BIOS recognised the battery without error codes, charge acceptance stepped normally through CC and CV phases, and the protection circuit responded correctly to a load spike during a CPU stress pass.
- Post-install calibration on the Yoga 13W: After fitting, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle on the Yoga 13W and clears the inaccurate health warning that appears after every cell swap — skipping this step leaves the fuel gauge IC working off stale EEPROM data from the old cell.
BIOS reporting poor battery health immediately after fitting a new cell
The Yoga 13W BIOS reads health data from EEPROM stored on the battery's BMS — not from live cell voltage. When a new cell goes in, that EEPROM has no charge history, so the BIOS flags it as degraded or unknown. This is not a fault with the replacement cell. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100%. After two to three cycles the fuel gauge IC builds a new charge profile and the health warning clears.
Yoga 13W shutting down abruptly while the OS still shows 20–30% remaining
This happens when the cell voltage drops sharply under combined CPU and display load — a voltage cliff the fuel gauge IC did not predict because it was calibrated against the old, degraded cell. The OS percentage reading and the actual cell voltage are no longer aligned. Run the full discharge-to-hibernate calibration cycle described above. After calibration, the BMS cut-off should align with the OS reading at or below 5%.