Hughes 9201 BGAN Replacement Battery 11.1V 6600mAh

Hughes 9201 BGAN — 11.1V Li-ion Replacement Battery

This is an 11.1V, 6600mAh (73.26Wh) Li-ion battery for the Hughes 9201 BGAN portable satellite terminal. The 9201 BGAN is a field communications unit used for broadband connectivity via satellite in locations without terrestrial infrastructure. This cell replaces the original pack when the terminal can no longer hold charge through a full field session.

• Hughes 9201 BGAN platform fit: The 9201 BGAN uses a single removable Li-ion pack on a 3-cell series configuration. The BMS inside the terminal monitors cell voltage and temperature before authorising charge from the AC adapter — the connector and BMS handshake must match exactly, and this cell meets those requirements.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the bench. The BMS accepted the cell without fault codes, charge current ramped correctly through CC/CV phases, and the protection circuit tripped at the expected low-voltage cutoff under load.
• Post-swap calibration on the 9201 BGAN: After fitting this cell, run one full discharge to the terminal's auto-shutoff point, then charge uninterrupted to 100%. The satellite terminal's fuel gauge IC needs this cycle to re-anchor its capacity estimate against the new cell — skipping it leaves the remaining-charge readout unreliable for the first several sessions.

Why the 9201 BGAN reports low or unknown battery health after a cell swap

The 9201 BGAN stores battery state data in an EEPROM register that persists across power cycles. When a new cell goes in, the terminal reads stale cycle count and degradation data from that register and flags the battery as poor or unknown — even though the cell itself is fresh. This is not a fault with the replacement cell. Running a full discharge-to-shutoff followed by a complete uninterrupted charge allows the firmware to overwrite the old EEPROM values with accurate data from the new cell's first calibration pass.

9201 BGAN shutting down with charge remaining on the indicator

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The terminal's low-voltage protection triggers at roughly 9V across the 3-cell pack — but if the gauge is miscalibrated, the terminal interprets a mid-range state of charge as critically low and cuts power. The fix is two or three complete discharge-to-shutoff and full-recharge cycles, which gives the gauge IC enough data points to map the new cell's voltage curve accurately. After those cycles, the displayed percentage and actual shutoff point will align.