About this replacement
Lenovo ThinkPad E590 / E490 / E580 Series — 11.1V Li-Polymer Replacement Battery (L17C3P51)
This is an 11.1V, 4050mAh (44.96Wh) Li-Polymer battery for the Lenovo ThinkPad E490, E490s, E580, E585, and E590 series laptops. It replaces OEM part numbers including L17C3P51, L17M3P51, L17M3P52, L17M3P53, L17M3P54, 01AV446, 01AV448, SB10K97607, SB10K97609, and SB10T83130 among others. Voltage and connector match the original cell exactly.
- E-series ThinkPad platform fit: The E490, E580, E585, and E590 share the same three-cell Li-Polymer battery architecture, connector pinout, and BMS communication protocol — which is why Lenovo released multiple OEM part numbers (L17C3P51 through L17M3P54) that all cross-reference the same physical cell.
- Bench tested on actual hardware: We ran this cell on a ThinkPad E590 and confirmed the BMS handshake completed on first boot, charge current accepted normally through the full range, and the BIOS battery status page populated without error flags.
- Post-install discharge cycle on ThinkPad E-series: After fitting this cell, run one full discharge to 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 this platform.
BIOS reporting battery health as "poor" immediately after replacement
When a new cell is installed in the ThinkPad E-series, the BIOS reads EEPROM data that was written for the old, degraded cell. The health status is calculated against that stored history, not the physical capacity of the new cell. Until the firmware runs a full learn cycle — discharge to cutoff, then a complete uninterrupted charge — it treats the new cell as another degraded one. After one or two complete cycles, the BIOS recalibrates and the health warning clears.
Laptop shuts down at 20–30% remaining shown on screen
This happens because the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The percentage shown is based on the old cell's discharge profile, so the OS calls shutdown long before the cell is actually empty. The new cell hits a voltage cliff under combined CPU and display load that the uncalibrated gauge cannot predict accurately. Run two full discharge-to-hibernate and full-recharge cycles — after that, the fuel gauge IC maps the new curve and the early shutdowns stop.