Hemisphere S320 GNSS Replacement Battery 7.4V 2000mAh

Hemisphere S320 GNSS Receiver — 7.4V Li-ion Replacement Battery

This 7.4V, 2000mAh (14.8Wh) Li-ion battery replaces the original pack in the Hemisphere S320 and S320 GNSS positioning receivers. These are field survey instruments used in construction layout, topographic mapping, and site measurement. Swap this pack when the original no longer holds charge through a full measurement session.

• S320 and S320 GNSS compatibility: Both variants share the same battery bay dimensions and voltage rail. The 70.60 × 38.60 × 20.54mm form factor seats flush in both units, and the BMS voltage thresholds match what the S320 power controller expects at startup and during active GNSS tracking.
• Bench tested on actual hardware: We cycled this pack through cold-start initialisation and sustained satellite acquisition loads. The BMS held stable through the current spike when the GNSS module first locks onto signal — no cutoff, no voltage sag that triggers a low-power flag.
• First-deployment calibration: After installing this battery, run a full system calibration through the S320 instrument menu before heading to site. The receiver maps battery state during that calibration pass — skipping it causes the low-battery indicator to fire early on your first measurement session, even with a full charge.

BMS lockout after the S320 sat unused in a carry case for months

Li-ion cells self-discharge during storage. If the S320 sat packed away long enough, the cell voltage can drop below 2.5V per cell — the point where most BMS circuits lock the pack to prevent damage. At that voltage, the charger sees no response and the instrument shows nothing at power-on. Connect the battery to a charger and leave it for at least 30 minutes before concluding it is dead. Most BMS circuits have a trickle-recovery threshold that re-engages the protection circuit once the cells reach approximately 3.0V per cell, after which normal charging resumes.

S320 shuts down mid-logging session despite showing adequate charge

During a continuous logging session, the S320 sustains current draw across the GNSS module, internal processor, and data storage simultaneously. If the cell capacity has degraded, this combined load pulls voltage down faster than the display indicator updates — the instrument cuts off before the gauge reaches zero. This is not a firmware fault. It is voltage dropout under sustained load, and it gets worse as cells age. A new 2000mAh pack restores the headroom the receiver needs to complete a full session without an abrupt shutdown.