About this replacement
Lenovo Yoga 900 / Yoga 4 Pro — 7.5V Li-Polymer Replacement Battery (L14M4P24)
This is a 7.5V, 8700mAh (65.25Wh) Li-Polymer battery for the Lenovo Yoga 900 and Yoga 4 Pro 2-in-1 laptop series. It replaces OEM part numbers L14M4P24, L14L4P24, 5B10H43261, and 5B10H55224. Fit models include the Yoga 900-13ISK and other Yoga 900-series variants.
- Yoga 900 series compatibility: These models share the same 7.5V cell configuration, flat Li-Polymer form factor, and BMS handshake protocol. The connector pinout and physical dimensions (265.54 × 126.32 × 4.85mm) are consistent across the Yoga 900 and Yoga 4 Pro chassis, so one cell covers all listed variants without modification.
- Bench tested on actual hardware: We ran this cell through charge, discharge, and load cycles on a Yoga 900 board. The BMS communicated correctly with the EC, charge current ramped normally, and the protection circuit triggered at the expected low-voltage cutoff without requiring a manual reset.
- Post-install calibration on the Yoga 900: After installing, run one full discharge until the laptop hibernates, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
Laptop shutting down at 20–30% after battery swap on the Yoga 900
This happens because the fuel gauge IC still holds calibration data from the old, degraded cell. The new cell has higher actual capacity, but the IC's internal model predicts voltage collapse earlier than it actually occurs. Under combined CPU and display load, the firmware cuts power at the old cell's voltage cliff point — not the new cell's. Running two full discharge-to-hibernate and uninterrupted-charge cycles forces the IC to rebuild its model against the new chemistry.
BIOS reporting new Yoga 900 battery Wh as incorrect or mismatched
The Wh figure shown in Lenovo Vantage or BIOS comes from EEPROM data written to the battery controller, not a live measurement. When a replacement cell is installed, the EEPROM may report a rated value that differs slightly from the actual chemistry delivered. This is not a fault — it reflects a difference between factory-rated and measured capacity. After one full calibration cycle, the system-reported value will stabilise. If the BIOS still shows an unexpected figure, check it against the rated 65.25Wh (8700mAh at 7.5V) as the baseline.