About this replacement
Lenovo IdeaPad U310 — 11.1V Li-Polymer Replacement Battery (L11M3P01)
This is an 11.1V, 4100mAh (45.51Wh) Li-Polymer replacement battery for the Lenovo IdeaPad U310 ultrabook. It fits the U310, U310-ITH, U310-IFI, and U310 Ultrabook variants, among others. Install it when the original cell no longer holds charge or the system reports poor battery health.
- U310 series compatibility: These models share the same 11.1V three-cell configuration, connector pinout, and BMS handshake protocol. The L11M3P01 part number covers the full U310 lineup because the voltage rail and EEPROM communication spec did not change across trim levels.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a U310 unit. The BMS negotiated correctly, the fuel gauge IC registered capacity without error flags, and the system accepted the cell without triggering an unknown battery warning.
- First-cycle calibration on the U310: After installing, run one full discharge until the laptop hibernates at the low-voltage cutoff, then charge uninterrupted to 100%. This forces the 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 battery health as poor after fitting a new L11M3P01
The U310 BIOS reads capacity data stored in the cell's EEPROM and compares it against its own learned baseline from the previous battery. A new cell with different EEPROM values triggers a health warning immediately on first boot — this is a data mismatch, not a fault with the replacement. The fix is a full learn cycle: discharge to hibernate cutoff, then charge to 100% without interruption. After two to three cycles the BIOS recalibrates and the warning clears.
U310 shutting down at 20–30% charge shown on screen
This happens when the cell voltage drops below a sustainable threshold under combined CPU and display load before the fuel gauge reaches zero. The fuel gauge IC is reading state-of-charge from a profile built on the old, degraded cell — it does not yet know the new cell's discharge curve. The laptop hits the hardware undervoltage cutoff while the OS still shows charge remaining. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100%, and the fuel gauge IC will remap its profile to the new cell's actual voltage curve.