Topcon FC-5000 Replacement Battery 3.7V 10400mAh

Topcon FC-5000 — 3.7V Li-ion Replacement Battery (1013591-01)

This is a 3.7V Li-ion battery rated at 10,400mAh (38.48Wh), built to replace OEM part 1013591-01 in the Topcon FC-5000 field controller. The FC-5000 is a rugged data collector used in surveying and construction for GPS positioning, data logging, and instrument control. This replacement fits both FC-5000 and FC5000 unit designations.

• FC-5000 and FC5000 compatibility: Both model designations use the same battery bay, connector pin-out, and BMS handshake protocol tied to OEM part 1013591-01. No hardware modification is needed — the battery management system reads the pack identically across both unit variants.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on an FC-5000 unit, monitoring BMS communication and cell voltage under simulated GPS logging and sensor polling loads. The BMS reported state-of-charge correctly throughout, with no cutoff events during sustained data acquisition.
• First-deployment calibration: After installing this battery, run a full calibration cycle through the FC-5000 instrument menu before taking it into the field. The controller maps battery state during that calibration pass — skipping it causes the low-battery warning to trigger prematurely on the first measurement session, even at high charge levels.

FC-5000 shutting down mid-logging when GPS fix is acquired

When the FC-5000 locks onto a GPS constellation, the receiver module draws a brief current spike as it initialises position tracking. An aged or deeply discharged pack cannot sustain voltage through that spike, and the BMS trips the output to protect the cells. This shows up as a sudden shutdown right at the moment a fix should be confirmed — not during idle navigation. A fresh pack at full charge handles the surge without voltage sagging below the BMS cutoff threshold. If shutdowns persist after replacing the battery, check that the calibration cycle completed fully before field deployment.

FC-5000 not recognising a new battery after the unit sat in a case for months

Li-ion cells in storage self-discharge slowly, and if the pack voltage drops below approximately 2.5V per cell, the BMS enters a protection sleep state and stops communicating with the controller. The FC-5000 reads this as an absent or unrecognised battery rather than a low one. To recover the pack, connect it to the charger and leave it for at least 30 minutes before attempting to power on the unit — most BMS circuits require a trickle charge to exit sleep mode and resume normal operation. If the charger shows no activity after 30 minutes, reseat the battery and confirm the charge contacts are clean and making full contact.