Schenker Slim 15-L17 Replacement Battery 14.4V 2200mAh

Schenker Slim 15-L17(N751WU) / Slim 17-L17(N770WU) — 14.4V Li-ion Replacement Battery

This is a 14.4V, 2200mAh (31.68Wh) Li-ion replacement battery for the Schenker Slim 15-L17(N751WU), Slim 17-L17(N770WU), and Slim 15-L17(10504565). It fits the original battery bay and connects via the stock connector. Install it when the original cell no longer holds a useful charge or stops accepting power entirely.

• Slim 15 and Slim 17 platform fit: Both the N751WU and N770WU chassis share the same 14.4V battery rail, connector pinout, and BMS handshake protocol — one cell covers both. The BMS reads voltage, current, and temperature identically across both board revisions.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on an N751WU board. The BMS accepted the cell without fault codes, charge current ramped correctly to CV phase, and protection tripped cleanly at the low-voltage cutoff threshold.
• Post-install calibration on the Slim 15: After fitting, run one full discharge to hibernate cutoff — let the laptop shut itself down — then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on the first boot after every cell swap.

BIOS reporting poor battery health immediately after fitting this cell

The Schenker Slim 15 BIOS reads health data from EEPROM embedded in the battery pack. When a new cell arrives, that EEPROM holds factory baseline data that does not match the BIOS's stored discharge history from the old cell. The firmware flags this mismatch as "poor health" or "replace battery" even though the cell is new. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to rewrite its reference data against the new cell's actual voltage curve. After that single calibration cycle, the health indicator updates correctly.

Laptop shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC's state-of-charge map is still calibrated to the old, degraded cell. The new cell hits a voltage cliff under combined CPU and display load at a point the IC still maps as 20–30% remaining. The laptop interprets the voltage drop as a critical low and cuts power immediately. To fix it, run two to three full discharge-to-hibernate cycles followed by uninterrupted charges to 100% — this gives the fuel gauge IC enough data to remap the new cell's actual capacity curve. After calibration, shutdowns should stop well below 10% indicated charge.