MSI GE40 2PC-486XCN Compatible Battery 11.1V 4400mAh BTY-M46

MSI GE40 Series — 11.1V Li-ion Replacement Battery (BTY-M46)

This is an 11.1V, 4400mAh Li-ion replacement battery for the MSI GE40 laptop series. It fits models including the GE40 2PC-486XCN, GE40 20C-002CN, GE40-i760M2811, and GE40 20L-235XCN, among others. OEM part numbers BTY-M46 and 925T2015F both apply to this cell.

• GE40 series compatibility: These GE40 variants share the same 11.1V three-cell architecture, connector pinout, and BMS handshake protocol — which is why a single cell covers the full model range. The voltage rail and charge termination logic are consistent across every SKU in this lineup.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a GE40 platform. The BMS communicated correctly with the EC, charge termination triggered cleanly at 100%, and the protection circuit held steady under sustained CPU and GPU load.
• First-cycle calibration on the GE40: After fitting the new cell, 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 almost always appears after a cell swap on this platform.

Why the GE40 BIOS flags a new battery as poor health immediately after swap

The GE40's embedded controller reads health data stored in the old cell's EEPROM and compares it against the new cell's reported values. A fresh cell has no charge history, so the EC interprets the mismatch as a fault and raises a health warning. This is not a hardware failure — it is a data calibration gap. Running one complete discharge-to-hibernate then a full uninterrupted charge gives the EC enough cycle data to rewrite its baseline and clear the flag.

GE40 shutting down at 20–30% charge shown on screen

The fuel gauge IC on the GE40 motherboard maps its discharge curve against learned data from the previous cell. When a new cell is installed, that learned curve no longer matches the actual voltage profile of the fresh chemistry. Under full CPU plus display load the voltage drops faster than the gauge predicts, and the system hits the EC's low-voltage cutoff before the displayed percentage reaches zero. After two to three full calibration cycles the fuel gauge IC relearns the curve and the shutdowns stop. If the issue persists past three cycles, check the resting voltage at the connector — it should read at least 10.8V when the screen shows 20%.