About this replacement
Leica GPS Totalstation / Theodolite Series — 12V Ni-MH 9000mAh Replacement Battery (GEB171)
This is a 12V 9000mAh Ni-MH replacement for the Leica GEB171 battery pack. It fits GPS Totalstations, Theodolites, Total stations, and the Tracker TDRA6000 series. Voltage and capacity match the original specification — 108Wh total energy storage.
- GPS Totalstation and Tracker TDRA6000 compatibility: These instruments share the same 12V bus, GEB171 form factor, and connector pinout. The BMS handshake protocol is identical across the platform, so the pack registers correctly in each device's power management system without modification.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on a Leica-compatible test rig, monitoring BMS response during the initialisation handshake and under sustained sensor load. Voltage stayed within the acceptable window throughout the draw profile typical of active GPS measurement sessions.
- First-use calibration on Leica survey instruments: After installing, run a full calibration cycle through the instrument menu before field deployment. Leica totalstations map battery state during calibration — skipping this step causes premature low-battery warnings to appear on the first measurement session, even with a fully charged pack.
BMS lockout after the GEB171 pack sat unused in a carry case
Ni-MH cells self-discharge during storage. If the pack drops below approximately 9V while unused, the BMS enters a protective lockout state and the instrument will not recognise it as a valid power source. The charger may also refuse to start a charge cycle because the pack voltage sits below its initiation threshold. To recover, use a compatible Ni-MH charger with a manual or "force charge" mode that can push a low-current trickle charge until the pack rises above 10.5V — at that point the BMS exits lockout and normal charging resumes.
Instrument shuts down during USB data transfer to PC with the battery showing charged
USB data transfer to a PC draws additional current on top of the active sensor load — the combined draw can exceed what a partially degraded or recently installed pack delivers without a voltage dip. When the voltage sags below the instrument's cutoff threshold, the totalstation powers off to protect its data integrity circuits. This is not a fault with the pack itself — it is a load-management response. Charge the pack fully before any transfer session, and confirm the instrument reads at least 11.8V at the battery status screen before initiating the transfer.