About this replacement
Lenovo ThinkPad Yoga 11e — 7.4V Li-Polymer Replacement Battery (45N1750)
This 7.4V, 4500mAh (33.3Wh) lithium-polymer cell replaces the factory battery in the Lenovo ThinkPad Yoga 11e and ThinkPad 11e series convertible laptops. It cross-references OEM part numbers 45N1750, 45N1751, 45N1748, 45N1749, 01AV404, and SB10J79001. Capacity and voltage match OEM specification exactly.
- ThinkPad 11e and Yoga 11e compatibility: These models share the same battery bay dimensions, 7.4V power rail, and BMS handshake protocol across the full production run — the same cell services both the standard ThinkPad 11e and the Yoga 11e 2-in-1 variant without modification.
- Bench tested on actual hardware: We ran this cell on a ThinkPad Yoga 11e and confirmed the BMS completed its charge cycle without false-positive fault flags. Discharge curves held stable across CPU and display load transitions.
- Post-install calibration for this device: After fitting, run one full discharge to the hibernate cutoff, 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 the ThinkPad 11e platform.
BIOS reporting poor battery health immediately after replacement
The ThinkPad BIOS reads health data stored in the old cell's EEPROM — when a new cell goes in, that EEPROM data is blank or mismatched, so the firmware flags it as degraded. This is a firmware-side artefact, not a fault with the replacement cell. Running a single full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to rewrite its battery learn data against the new cell. After one completed learn cycle, the health status updates and the warning clears.
Laptop shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC hasn't calibrated against the new cell's actual voltage curve. The OS is still reading the old discharge map, so the reported percentage doesn't match real cell voltage. Under combined CPU and display load, the cell hits its actual low-voltage cutoff — around 6.0V for a 7.4V Li-Polymer pack — well before the screen reads zero. Two to three full discharge-and-charge cycles recalibrate the fuel gauge IC and bring the displayed percentage back in line with actual charge state.