About this replacement
Lenovo IdeaPad U410 — 7.4V Li-Polymer Replacement Battery (L10M4P11)
This 7.4V, 7900mAh (58.46Wh) lithium-polymer battery replaces the original cell in the Lenovo IdeaPad U410 ultrabook. It fits the standard U410 as well as specific variants including the i5-3317U, 25-203730, and Touch-59372989 models. Cross-references include L10M4E21, L09C4B21, 40Y7903, and 2ICP4/51/161-2.
- IdeaPad U410 platform fit: All U410 variants listed share the same 7.4V two-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol. The same physical cell and EEPROM communication spec applies across the standard chassis and Touch subvariant.
- Bench tested on actual hardware: We ran this cell through charge-discharge cycles on a U410 chassis. The BMS accepted the new cell without error flags, the protection circuit tripped correctly at low-voltage cutoff, and charge termination engaged at full capacity without anomaly.
- Post-install calibration on the U410: After fitting, run the laptop down to hibernate-cutoff on battery only — no AC during discharge. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false "poor health" warning that appears after every cell swap on this platform.
Why the U410 shuts down at 20–30% charge remaining
This happens when the fuel gauge IC is still calibrated against the old depleted cell. The new cell has a steeper voltage curve than the degraded one the IC learned from. Under combined CPU and display load, the voltage drops sharply in a way the miscalibrated gauge reads as empty. The fix is two full discharge-to-hibernate and uninterrupted charge cycles — after that the gauge IC maps the correct curve and shutdowns stop.
BIOS reporting wrong Wh rating after cell swap
The Wh value shown in BIOS or Lenovo Vantage comes from EEPROM data written at the factory, not from a live measurement of the new cell. A replacement cell carries its own EEPROM rated value, which may differ from the original. This is a data mismatch, not a fault — the cell still delivers its full 58.46Wh. If the figure matters for asset tracking, one calibration cycle after install will prompt the firmware to update the displayed value.