Leica GEB111 6V Replacement Battery TPS400 2100mAh

Leica TPS400 / TPS700 / TPS800 Series — 6V Ni-MH Replacement Battery (GEB111)

This 6V, 2100mAh Ni-MH battery replaces the Leica GEB111 and GEB112 packs used in the TPS400, TPS700, TPS800, and DNA series total stations and digital levels. It matches the original voltage rail and connector format. Capacity is rated at 12.6Wh, consistent with Leica's published spec for these instruments.

• TPS and DNA platform fit: These instrument families share the same battery bay dimensions, 6V supply rail, and GEB-format connector. The BMS communication protocol is consistent across TPS400 through TPS800, so the same pack serves all three series without pin or firmware conflicts.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on a TPS series instrument and monitored BMS handshake at power-on. The protection circuit held within spec under the initialisation current spike that occurs when the EDM module powers up.
• Post-install calibration cycle: After fitting this battery, run a full calibration sequence through the instrument's onboard menu before field deployment. The TPS series maps battery state during calibration — skipping this step causes the low-battery indicator to trip prematurely on the first measurement session in the field.

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

Ni-MH cells self-discharge over time, and the GEB111 pack can drop below the BMS recovery threshold — typically around 4.8V — after extended storage. When cell voltage falls below this floor, the protection circuit locks out and the charger shows no activity or a fault light. The fix is to apply a low-current trickle charge directly to the pack for 15–30 minutes using a compatible charger before attempting a normal charge cycle. Once the pack reaches approximately 5.5V, the BMS re-initialises and accepts a full charge normally.

Total station shuts down mid-measurement with no low-battery warning

This happens when the combined load of the EDM, servo motors, and display causes a voltage sag that the BMS reads as an overcurrent or undervoltage event — even if the charge indicator showed adequate capacity seconds earlier. Ni-MH cells are more susceptible to this under cold conditions, as internal resistance rises and the voltage drop under load is sharper. Check the pack voltage under load using the instrument's diagnostics screen; a healthy pack should hold above 5.4V during an active measurement cycle. If voltage sags below that threshold during EDM firing, the cells have lost enough capacity that a replacement is the correct next step.