About this replacement
Lenovo Yoga C740-14IML — 7.72V Li-Polymer Replacement Battery (L18M4PE0)
This 7.72V, 6500mAh (50.18Wh) Li-Polymer cell replaces the original battery in the Lenovo Yoga C740 14 and Yoga C740-14IML convertible notebooks. It crosses to OEM part numbers L18L4PE0, L18M4PE0, 5B10U40209, 5B10U40210, 5B10W67185, 5B10W67296, SB10W67235, and SB10W67368. The connector layout and BMS handshake match the factory spec for this 2-in-1 platform.
- Yoga C740 14 and C740-14IML compatibility: Both models run the same 7.72V battery rail, share the same connector pinout, and use the same BMS communication protocol — which is why one cell covers the full C740 14 lineup.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a C740-14IML unit. The BMS accepted the new cell without fault codes, reported state-of-charge correctly after calibration cycles, and held voltage stable under combined CPU and display load.
- Post-install calibration on the C740: After fitting this cell, run one full discharge until the laptop hibernates, then charge uninterrupted to 100%. This forces the Lenovo BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting poor battery health immediately after replacement on the C740
The Lenovo BIOS stores battery health data from the previous cell in its EEPROM. When a new cell goes in, the BIOS compares current readings against that stored baseline and flags a mismatch as poor health — even though the new cell is fine. This is not a fault with the replacement; it is a calibration state. Run one full discharge-to-hibernate cycle followed by a complete uninterrupted charge. After two to three cycles, the BIOS rewrites the EEPROM data against the new cell and the warning clears.
Yoga C740 shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's voltage curve. The IC uses the old cell's curve to estimate remaining charge, so the displayed percentage does not match actual cell voltage — the laptop hits the hardware low-voltage cutoff while the OS still shows 20–30%. It is not a faulty cell. Complete two full discharge-to-hibernate and charge-to-100% cycles. After that, the fuel gauge recalibrates and the cutoff aligns with the displayed percentage; the shutdown will occur at or below 5%.