Hi-Target F61 GNSS Replacement Battery 7.4V 5000mAh BL-5000

Hi-Target F61 / F66 / H32 / V30 Series — 7.4V Li-ion Replacement Battery (BL-5000)

This is a 7.4V 5000mAh Li-ion battery for the Hi-Target F61, F66, H32, and V30 GNSS receivers. It replaces OEM part BL-5000 and fits the same battery bay without modification. Capacity is 5000mAh (37Wh), matching the original specification.

• F61 / F66 / H32 / V30 platform fit: These four receivers share the same battery bay dimensions, connector pinout, and BMS communication protocol — one battery pack services the full range. The 7.4V nominal rail matches the receiver's internal DC regulator input across all listed models.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles and confirmed the BMS handshake with the receiver's battery management interface. The pack passed cell balancing checks and reported state-of-charge correctly on the receiver display.
• Post-installation calibration cycle: After fitting this battery, run a full calibration cycle through the receiver's system menu before field deployment. The F61 maps battery state during that sequence — skipping it causes premature low-battery warnings on the first measurement session, even with a full pack.

BMS lockout after the F61 sat unused in a carry case for months

Li-ion cells self-discharge over storage periods. If the pack voltage drops below approximately 2.5V per cell, the BMS enters a protective sleep state and blocks charge input — the receiver and charger both show no activity. To recover, apply a low-current pre-charge (around 0.1C) using a compatible charger that supports recovery mode, or use a bench charger set to 7.2V at 500mA until the pack responds. Once cell voltage climbs above the BMS wake threshold, normal charging resumes. Do not leave packs stored below 20% charge for extended periods.

GNSS receiver powers on but shuts down mid-session during active data logging

This is a voltage sag failure, not a capacity failure. Under sustained sensor and RF load — particularly when the receiver is logging RTK corrections and writing to internal storage simultaneously — current draw peaks and the battery voltage briefly dips below the BMS cutoff threshold. A new or partially degraded cell shows this more than a conditioned one. Charge the pack to full, run the calibration cycle, and check that the receiver firmware is current, as some versions have adjusted the low-voltage cutoff parameter. A healthy pack should hold above 7.0V under full operational load.