About this replacement
Compaq Armada M700 Series — 14.8V Li-ion Replacement Battery (134111B21)
This is a 14.8V 4400mAh (65.12Wh) Li-ion battery for the Compaq Armada M700 notebook series. It fits the M700-139116-AA4, M700-139117-BR2, M700-139120-206, M700-140142-016, and over 240 additional Armada M700 variants. The OEM part numbers it replaces include 134111B21, 135213-001, 135214-001, 144558-B21, and 167935-001 among others.
- Armada M700 platform fit: All M700 variants share the same 14.8V four-cell Li-ion voltage rail, physical bay connector, and BMS handshake protocol — which is why a single cell replacement covers the full range. The connector pinout and charge communication lines are identical across the series.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on M700 hardware. The BMS negotiated correctly with the system controller, charge termination fired at the expected voltage ceiling, and protection circuitry responded normally to load transitions.
- Post-swap BIOS calibration: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on the Armada M700 platform.
Armada M700 shutting down at 20–30% remaining after battery swap
This is a voltage cliff problem, not a capacity problem. Under combined CPU and display load, the new cell's voltage drops faster than the old BIOS fuel gauge data predicts — the system reads an immediate low-voltage event and cuts power. The BIOS is still referencing discharge curves from the degraded original cell. Run two full calibration cycles — discharge to hibernate-cutoff, then full uninterrupted charge — and the fuel gauge IC will remap against the new cell's actual discharge curve.
BIOS reporting wrong Wh rating after installing replacement cell
The Wh figure shown in BIOS or system information is pulled from EEPROM data stored on the battery's controller board, not measured live from the cells. Some replacement cells carry EEPROM values set to the rated chemistry spec rather than the exact OEM figure, which causes the mismatch. This does not affect actual charge capacity or cell behaviour — it is a stored label, not a functional fault. If the figure matters for asset management, compare actual measured Wh output against the 65.12Wh rating rather than relying on the EEPROM-reported value.