About this replacement
Lenovo ThinkPad T570 — 15.28V Li-Polymer Replacement Battery (00UR891)
This 15.28V, 2050mAh (31.32Wh) lithium-polymer cell replaces the internal battery in the Lenovo ThinkPad T570 15.6-inch business laptop. It matches OEM part numbers 00UR891, 00UR892, SB10L84122, SB10L84123, 00UR890, 01AV493, and SB10L84121. Voltage, connector pinout, and BMS communication protocol match the original specification.
- ThinkPad T570 compatibility: All T570 variants in this listing share the same 15.28V four-cell architecture, identical flex connector, and the same BMS handshake required by the EC firmware — so one cell covers the full T570 lineup regardless of sub-model suffix.
- Bench tested on actual hardware: We ran this cell on a T570 motherboard and confirmed the BMS authenticated correctly, the EC reported a valid battery presence, and charge current stepped down normally through CC to CV without tripping a fault state.
- First-cycle recalibration on ThinkPad T570: After fitting this cell, let the laptop discharge fully until it hibernates on its own, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false "poor health" warning the EC generates whenever it detects EEPROM data from a previous cell.
Why the T570 BIOS flags a new battery as poor health immediately after install
The ThinkPad EC reads charge history and wear data stored in the old cell's EEPROM. When a new cell arrives with a blank or mismatched EEPROM profile, the EC has no learned capacity baseline to compare against and defaults to a poor-health flag. This is a firmware behaviour, not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% gives the EC enough data to build a new baseline and clear the warning.
T570 shutting 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 chemistry. The gauge still uses voltage curves mapped to the old, degraded cell, so it misreads the remaining charge and triggers a shutdown well before the cell is actually empty. It is not a fault in this replacement cell. Run two to three full discharge-to-hibernate and full-charge cycles — after that the gauge re-maps its curve and the shutdowns stop. Confirm calibration is complete by checking that the EC reports voltage above 14.8V at the 20% display mark.