About this replacement
Lenovo ThinkPad L480 / L580 — 11.1V Li-Polymer Replacement Battery (L17C3P52)
This 11.1V, 4000mAh (44.4Wh) Li-Polymer battery replaces the original cell in the Lenovo ThinkPad L480 and L580. It matches OEM part numbers L17C3P52, L17M3P53, SB10K97613, 01AV464, and 01V466. Physical dimensions are 179.12 × 118.60 × 6.20mm — connector and retention tabs align with the original bay.
- L480 and L580 shared platform: Both models run the same 11.1V battery rail with an identical connector pinout and BMS handshake protocol. Lenovo shared the battery design across the L-series refresh, so one SKU covers both chassis without modification.
- Bench tested on actual hardware: We cycled this cell on a ThinkPad L480 under sustained CPU and display load. The BMS held voltage above the BIOS low-threshold cutoff through full discharge, and charge termination triggered correctly at capacity ceiling with no overcharge flags logged.
- Post-install discharge cycle: After fitting this cell, run a 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 ThinkPad hardware.
BIOS reporting battery health as poor after replacement
The ThinkPad BIOS reads health data from EEPROM registers written by the original cell. A new cell ships with blank or mismatched register values, so the firmware flags it as degraded even when the cell is fresh. This is not a fault with the replacement — it is a calibration state. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% allows the fuel gauge IC to write fresh baseline data, and the health warning clears on the next BIOS read.
Laptop shuts down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The OS reads a stale capacity map from the old EEPROM data and marks 20–30% as the floor, cutting power before the cell is truly exhausted. It is not a defective cell — it is a mismatch between stored discharge curves and the new chemistry. Complete two full discharge-to-hibernate and full-recharge cycles; the fuel gauge recalibrates and the shutdown threshold drops back to the correct low-voltage cutoff near 3.0V per cell.