About this replacement
Lenovo ThinkPad E590 / E490 Series — 11.1V Li-Polymer Replacement Battery (01AV463)
This 11.1V 4000mAh (44.4Wh) Li-Polymer battery replaces OEM part 01AV463 in the ThinkPad E590 and E490 series. It fits the 20NB0032CD, 20N8002JCD, 20NBA00ECD, and over 25 additional E490/E590 configurations. The cell dimensions are 179.42 × 120.00 × 6.55mm — same footprint as the factory pack.
- E490 and E590 platform compatibility: Both the E490 and E590 share the same battery bay dimensions, connector pinout, and BMS handshake protocol. One cell SKU covers both lines because Lenovo used a unified power rail at 11.1V across the E-series refresh cycle.
- Bench tested on actual hardware: We ran this cell on an E590 chassis and confirmed the BMS completed a full charge cycle without tripping a fault code. The protection circuit responded correctly to over-discharge cutoff and resumed charging after a brief rest period.
- Post-install discharge cycle on ThinkPad firmware: After fitting this battery, run one full discharge down to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on first boot after any cell swap.
Laptop shutting down at 20–30% shown after battery swap
This is a voltage cliff symptom, not a capacity fault. Under combined CPU and display load, the cell voltage drops faster than the fuel gauge IC expects based on its stored discharge curve. The BIOS interprets the sudden drop as a critical-level condition and triggers an emergency shutdown. Run two full discharge-recharge cycles without interruption — after that, the fuel gauge IC recalibrates its curve against the new cell chemistry and the shutdowns stop.
BIOS reporting battery health as poor immediately after replacement
The ThinkPad BIOS reads health data from the battery's EEPROM on every boot. A new cell ships with factory EEPROM values that do not match the charge history the BIOS expects to see, so it flags the battery as degraded. This is a data mismatch, not a cell defect. Run the battery learn cycle via Lenovo Vantage — navigate to Power → Battery Settings → Run the Battery Gauge Reset — and the health status will update to normal within one completed cycle.