About this replacement
Gateway M360 / M460 / M680 Series — 14.8V Li-ion Replacement Battery (SQU-412 / 103329)
This is a 14.8V, 4400mAh (65.12Wh) Li-ion battery for the Gateway M360, M460, M680, and NX500 notebook series. It replaces OEM part numbers including 103329, SQU-412, SQU-413, 916C3350F, and 3UR18650F-2-QC-MA1, among others. If your original cell is no longer holding a charge or your laptop refuses to run off battery, this is the direct cell replacement.
- M360 / M460 / M680 / NX500 platform fit: These models share the same 14.8V four-cell series architecture and connector pinout. The BMS on each uses the same charge termination logic, so one cell SKU covers the full range without any wiring or firmware conflict.
- Bench tested on actual hardware: We cycled this cell through charge-to-cutoff and discharge-to-hibernate on compatible hardware. The BMS held charge termination at the correct 16.8V ceiling and tripped the low-voltage cutoff cleanly without false shutdowns mid-cycle.
- First-cycle calibration tip for the M360 BIOS: After fitting this cell, run the laptop on battery until Windows forces hibernation, then charge it uninterrupted to 100%. This gives the BIOS fuel gauge IC one clean reference cycle against the new cell and clears the inaccurate health warning that appears immediately after every cell swap.
Why the M360 BIOS flags a new battery as "poor health" on first boot
The Gateway M360 BIOS reads health data from the battery's EEPROM on every boot. When a new cell goes in, the EEPROM holds factory default values that don't match the charge history the BIOS expects to see from a used pack. The system interprets the mismatch as a degraded cell rather than a fresh one. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the fuel gauge IC to rewrite its internal state against actual measured capacity, which clears the warning on the next boot.
Laptop shuts down at 20–30% shown on the M360 fuel gauge
This happens when the fuel gauge IC hasn't been calibrated against the new cell's actual voltage curve. The gauge was trained on the old, degraded cell and its low-voltage threshold is now misaligned — the laptop hits its hardware cutoff while the OS still shows charge remaining. It is not a fault with the replacement cell. Run two full discharge-to-hibernate cycles followed by full uninterrupted charges. After the second cycle, the fuel gauge recalibrates and the shutdown threshold should align with the displayed percentage at or below 5%.