Qianxun Q600 GNSS Replacement Battery 7.4V 2600mAh

Qianxun Q600 GNSS — 7.4V Li-ion Replacement Battery

This 7.4V, 2600mAh (19.24Wh) Li-ion battery fits the Qianxun Q600 GNSS receiver. The Q600 is a professional surveying instrument used for precision positioning, mapping, and construction layout. This pack slots directly into the Q600 battery bay and communicates with the receiver's onboard power management system.

• Q600 GNSS platform fit: The Q600 uses a 7.4V two-cell Li-ion architecture with a specific connector pinout and BMS handshake. This pack matches that voltage rail and pin configuration, so the receiver reads state-of-charge correctly rather than throwing a battery fault.
• Bench tested on actual hardware: We cycled the pack through full charge and discharge under satellite acquisition load. The BMS handled the current spike at GNSS module initialisation without tripping, and cell balance stayed within 20mV across both cells through three full cycles.
• First-deployment calibration: After installing, run a full calibration cycle through the Q600's instrument menu before heading into the field. The receiver maps battery state during calibration — skip this and you will see premature low-battery warnings on your first session even with a full pack.

Q600 BMS lockout after the receiver sat unused in a carry case for months

Li-ion cells self-discharge at roughly 2–3% per month. After extended storage in a case, the pack voltage can drop below the BMS recovery threshold — typically around 2.5V per cell, or 5.0V total for a 7.4V two-cell pack. When that happens, the BMS enters a protection state and the receiver will not power on even when connected to a charger. Place the pack in a compatible Li-ion charger that supports a trickle or recovery charge mode; once voltage climbs above 6.0V the BMS resets and normal charging resumes.

Receiver shuts down mid-logging session despite the battery indicator showing charge

Sustained GNSS logging pulls a steady current from both cells simultaneously, and if one cell has drifted lower than the other, the BMS cuts output the moment that weaker cell hits its low-voltage threshold — even while the indicator still reads partial charge from the stronger cell. This is not a faulty pack; it is cell imbalance. Fully charge the battery, then discharge it completely through normal use and charge again. After two full cycles the BMS re-balances the cells and the receiver's percentage indicator will track accurately.