Hi-Target V8 GNSS Replacement Battery BL-1400 7.4V 1600mAh

Hi-Target V8 / V9 / V10RTK GNSS Receiver — 7.4V Li-ion Replacement Battery (BL-1400)

This is a 7.4V, 1600mAh Li-ion replacement for the Hi-Target BL-1400 battery pack. It fits the V8, V9, and V10RTK GNSS receivers used in RTK surveying, mapping, and construction layout. Dimensions are 55.60 × 39.50 × 20.80mm — matching the original form factor.

• V8 / V9 / V10RTK compatibility: All three receivers share the same battery bay geometry, connector pinout, and BMS communication protocol. The BL-1400 designation covers the entire platform — one pack works across all three units without modification.
• Bench tested on actual hardware: We ran this pack through the V8 receiver's initialisation sequence, including satellite acquisition and RTK fix lock. The BMS held steady through the initial current draw spike at receiver power-up and did not trip during sustained tracking loads.
• Post-install calibration cycle: After fitting this pack, run a full calibration cycle through the V8 instrument menu before field deployment. The receiver maps battery state during calibration — skipping this step causes premature low-battery warnings during your first measurement session.

BMS lockout after the V8 sat unused in a carry case for months

Li-ion cells self-discharge during storage. If the pack drops below approximately 2.5V per cell (5.0V total), the BMS trips a protection circuit and locks out charge acceptance entirely. The receiver will not power on, and the charger shows no activity. To recover the pack, use a charger with a trickle or recovery mode that applies a low current below 100mA until cell voltage climbs above the BMS recovery threshold — typically 3.0V per cell — before normal charging resumes.

V8 receiver shuts down mid-RTK session with no low-battery warning

This usually points to voltage sag under sustained load, not low capacity. During an active RTK fix with the radio modem transmitting, current draw peaks sharply and cell voltage dips. An aged or partially degraded cell hits the BMS undervoltage cutoff at that peak — the receiver cuts out instantly with no warning because the indicator was reading resting voltage, not load voltage. Check resting voltage after a shutdown: if it reads above 7.0V but the unit still cut out, the cells can no longer hold voltage under load and the pack needs replacing.