About this replacement
Clevo W217CU / W217 — 11.1V Li-ion Replacement Battery (W217BAT-3)
This is an 11.1V 4400mAh (48.84Wh) Li-ion replacement battery for the Clevo W217CU and W217 notebooks. It replaces OEM part numbers W217BAT-3, W217BAT-6, 6-87-W217S-4D41, and 6-87-W217S-4DF1. Install it when the original cell no longer holds a charge through a normal work session.
- W217 series compatibility: The W217CU and W217 share the same battery bay dimensions, connector pinout, and BMS handshake protocol — all four OEM part numbers cross to this single replacement cell without any hardware modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a W217 unit, confirmed the BMS handshake completed correctly, and verified the fuel gauge IC updated charge state without throwing a fault code.
- First-cycle reset after install: After fitting this battery, run the laptop down to hibernate cutoff on battery power alone, then charge uninterrupted to 100%. This forces the BIOS to complete a battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting poor battery health immediately after replacement
The W217 BIOS reads health data from an EEPROM register that carries over charge history from the old cell. When a new battery goes in, the BIOS compares the fresh cell against stale cycle count and capacity data — and flags it as degraded. This is not a fault with the replacement cell. Run one full discharge-to-hibernate then a full uninterrupted charge to 100%. After that cycle, the BIOS recalibrates against the new cell and the health warning clears.
Laptop shuts down at 20–30% charge shown on the fuel gauge
This happens because the fuel gauge IC is still calibrated against the old cell's voltage curve. With a new cell installed, the IC misreads where the actual voltage cliff sits — it reports 20–30% remaining at the moment the cell can no longer sustain voltage under full CPU and display load, triggering an immediate shutdown. The fix is three to four full discharge and recharge cycles. After that, the IC maps the new cell's curve correctly and the gauge tracks accurately down toward 0V cutoff, typically around 9.0V at the pack terminals.