About this replacement
Clevo W217CU / W217 — 11.1V Li-ion Replacement Battery (W217BAT-3)
This is an 11.1V Li-ion replacement battery for the Clevo W217CU and W217 notebook computers. It carries a capacity of 2200mAh (24.42Wh) and matches OEM part numbers W217BAT-3, W217BAT-6, 6-87-W217S-4D41, and 6-87-W217S-4DF1. The cell fits the original battery bay without modification.
- W217CU and W217 platform fit: Both models share the same 11.1V three-cell battery rail, connector pinout, and BMS communication protocol — one cell covers both. The SMBus data lines carry charge state and health data to the BIOS using the same register map across this series.
- Bench tested on actual hardware: We cycled this cell on a W217-series chassis and confirmed the BMS handshake completed cleanly, charge termination triggered at the correct voltage ceiling, and the protection circuit tripped as expected on a simulated over-discharge condition.
- Post-install calibration on the W217: After fitting, run one full discharge until the laptop hibernates at the low-voltage cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting poor battery health immediately after fitting the W217BAT-3
The W217 BIOS reads health data from EEPROM registers that were written by the original cell during its service life. A new cell arrives with fresh EEPROM values that don't match the accumulated cycle history the BIOS expects, so it flags the battery as degraded before a single cycle has run. This is a data mismatch, not a fault with the replacement cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — the BIOS learn cycle rewrites those registers against the new cell. The health warning clears after one or two completed cycles on most W217 units.
W217CU shutting down abruptly at 20–30% charge shown on screen
This happens when the cell hits a voltage cliff under combined CPU and display load — the fuel gauge IC is reading state-of-charge from a model calibrated to the old cell's discharge curve, not the new one. The reported percentage and the actual cell voltage fall out of sync, so the laptop cuts power before the gauge reaches zero. It is not a faulty cell — it is an uncalibrated fuel gauge IC. Run two full discharge-to-hibernate and full charge cycles without interrupting the charge, and the IC recalibrates its model. After calibration, confirm resting voltage at the reported 30% mark sits between 10.8V and 11.1V — if it does, the gauge is now tracking correctly.