About this replacement
Lenovo Yoga Duet 7 13ITL6 — 7.72V Li-Polymer Replacement Battery (L20M4PE0)
This 7.72V, 5150mAh (39.76Wh) lithium-polymer cell replaces the original L20M4PE0 battery in the Lenovo Yoga Duet 7 13ITL6 convertible. It fits the full 13ITL6 lineup, including variants 82MA0025AX, 82MA0074HH, 82MA001NCK, 82MA006MGE, and 139 additional regional SKUs. The cell matches OEM part numbers L20M4PE0, 5B11B44627, 5B11B44628, and SB11B44629.
- 13ITL6 variant compatibility: All 82MA-series Yoga Duet 7 13ITL6 units share the same 7.72V two-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol — regional SKU differences are in the wireless card and keyboard layout, not the battery bay or charge circuit.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the 13ITL6 platform. The BMS completed handshake without error, charge current stepped down correctly at 4.35V per cell, and the protection circuit responded to over-current as expected.
- Post-install calibration on the Yoga Duet 7: After fitting, run one full discharge to the hibernate cutoff, then charge uninterrupted to 100% without interruption. This forces the BIOS to run its battery learn cycle against the new cell and clears the inaccurate "poor health" flag that nearly always appears on first boot after a cell swap.
Laptop shutting down at 20–30% remaining after battery swap
This happens because the fuel gauge IC still holds calibration data from the old, degraded cell. The new cell has a different discharge curve, so the gauge calls "empty" well before actual depletion. Under full CPU plus display load, the Yoga Duet 7 hits a voltage cliff where the pack voltage drops faster than the gauge expects, triggering an emergency shutdown. Running two or three full discharge-to-hibernate and charge-to-100% cycles resets the IC's internal model. After calibration, the gauge tracks the new cell accurately and the premature shutdowns stop.
BIOS reporting battery health as poor or unknown after replacement
The Lenovo BIOS reads health status from EEPROM data written by the original cell's embedded controller. A new cell ships with factory EEPROM values that don't match the wear history the BIOS expects, so it flags the battery as degraded or unrecognised. This is a data mismatch, not a fault with the replacement cell. Run the battery learn cycle — one full discharge to hibernate followed by an uninterrupted charge to 100% — and the BIOS will rewrite its health baseline against the new cell's actual readings.