Trimble 5700 GPS Receiver Replacement Battery 7.4V 2000mAh

Trimble 5700 / 5800 GNSS Receiver — 7.4V Li-ion Replacement Battery (29518)

This 7.4V 2000mAh Li-ion battery fits the Trimble 5700 and 5800 GNSS receivers, along with a wider range of Trimble survey instruments sharing the same battery bay. OEM part numbers covered include 29518, 38403, 46607, 52030, 92600, 92670, C8872A, and EI-D-LI1. It is a direct swap for field surveyors running extended sessions on site without access to mains charging.

• 5700 and 5800 platform fit: These two receivers share the same battery bay geometry, connector pinout, and BMS communication protocol — which is why one pack covers both. The battery negotiates charge state with the receiver's internal controller over the same data line used for fuel gauge reporting.
• Bench tested on actual hardware: We cycled this pack through the 5700's charge management circuit and monitored BMS handshake at power-on. The protection circuit held within spec under the initialisation current spike and passed charge-state reporting to the receiver display without error flags.
• First-deployment calibration: After fitting this battery, run a full calibration cycle through the receiver's onboard menu before the first field session. The 5700 maps battery state during that sequence — skipping it causes the receiver to throw premature low-battery warnings partway through your first logging session, even with a full pack.

BMS cutoff when the 5700 powers up a connected antenna or external module

At power-on, the 5700 simultaneously initialises its internal GNSS engine and supplies current to any connected antenna or external device on the data port. That combined inrush can hit 1.8–2.2A for 200–400ms — enough to trip an aged or cold-soaked pack's overcurrent threshold before normal operation begins. A fresh pack with healthy cells handles this spike without cutoff. If the receiver shuts off immediately at power-on with a full charge, check ambient temperature first — Li-ion internal resistance rises sharply below 5°C and makes cutoff trips more likely. Warm the pack to above 10°C and retry before assuming a fault.

5700 receiver shows full charge on screen but shuts down during active logging

This happens when the receiver's battery indicator is reading open-circuit voltage from a resting pack, then the load during active satellite tracking drops cell voltage below the receiver's cutoff threshold mid-session. It is a voltage-sag issue, not a capacity issue — the pack may genuinely hold 2000mAh but cannot sustain the discharge rate under full GNSS load without dropping below 6.0V. After fitting a new pack, run the calibration cycle so the receiver re-maps the voltage-to-capacity curve against your actual cells. On the first post-calibration session, the percentage readout will stabilise and track accurately through the logging window.