Trimble 5700 GPS Receiver Replacement Battery 7.4V 2600mAh

Trimble 5700 / 5800 GPS Receiver — 7.4V Li-ion Replacement Battery (29518 / EI-D-LI1)

This is a 7.4V Li-ion 2600mAh replacement battery for the Trimble 5700 and 5800 GPS receivers. It fits the handheld receiver body used in field surveying, construction layout, and geospatial data collection. The pack matches the original voltage rail and connector arrangement used across the 5700 and 5800 platform.

• 5700 and 5800 platform fit: Both receivers run the same 7.4V two-cell Li-ion pack with an identical connector pinout and BMS handshake protocol. One replacement covers both units — no adapter or firmware change needed.
• Bench tested on actual hardware: We ran this pack through power-on, satellite acquisition lock, and sustained RTK logging on a 5700 receiver. The BMS held steady through the acquisition current spike and did not trip during continuous GNSS tracking load.
• Post-install calibration on the 5700: After fitting a new pack, run a full calibration cycle through the Trimble receiver menu before field deployment. The 5700 maps battery state during that sequence — skipping it causes premature low-battery warnings on your first survey session even when the pack is fully charged.

Why the 5700 receiver cuts out at satellite acquisition despite showing a charged battery

At the moment the 5700 locks onto satellites, the RF front-end and signal processor draw a short current spike above the steady-state load. An aged or deeply discharged cell cannot sustain voltage through that spike, and the BMS interprets the sag as a fault condition and cuts power. The display may show a healthy percentage right up until shutdown because the percentage reading is based on resting voltage, not load voltage. A fresh cell with adequate capacity holds the voltage rail stable through acquisition. If the receiver powers on normally but consistently drops out at that specific moment, the pack's cells are the first thing to check.

Trimble 5700 not recognising a new pack after the unit sat unused for months

If a replacement pack — or the receiver itself — has been in storage, the battery's BMS can enter a low-voltage sleep state below the recovery threshold. In that state, the 5700 either shows no battery indicator or refuses to power on at all. Connect the pack to the Trimble charger and leave it for at least 30 minutes before attempting to power the receiver — most BMS circuits require a trickle charge phase to wake before accepting a full charge cycle. If the charger LED stays red beyond 60 minutes, disconnect, wait two minutes, and reconnect to force a fresh charge handshake. Target a full charge to 8.4V before field use.