Leica GBE211 Survey Battery 7.4V 3400mAh Li-ion

Leica ATX1200 / GRX1200 Series — 7.4V Li-ion Replacement Battery (GBE211)

This 7.4V 3400mAh Li-ion battery replaces the GBE211 and GEB211 packs used in Leica ATX1200 and GRX1200 total stations, as well as the Piper 100 and Piper 200 laser plummets. It slots into the standard battery bay and connects via the OEM-matched terminal block. Voltage and capacity match the original Leica specification exactly.

• ATX1200, GRX1200, and Piper platform fit: These models share a common 7.4V two-cell architecture and the same physical connector and BMS handshake protocol. One battery covers the full platform, which matters when a crew is running mixed instruments on the same job site.
• Bench tested on actual hardware: We ran this pack through power-on and servo initialisation on an ATX1200 body. The BMS held steady through the motor drive current spike at startup and maintained output through a full angle and distance measurement cycle without triggering an over-current cutoff.
• Post-install calibration on the ATX1200: After fitting this pack, run a full instrument calibration sequence through the ATX1200 menu before heading into the field. The total station maps battery state during calibration — skip this step and the instrument will throw premature low-battery warnings partway through your first measurement session.

ATX1200 BMS lockout after the pack sat unused in a carry case for months

Li-ion cells self-discharge during storage. If this pack sat unused long enough, cell voltage may have dropped below the BMS protection threshold — typically around 2.5V per cell. At that point the BMS opens the discharge circuit and the instrument will not power on, even with the battery fully seated. To recover, place the pack in a Leica-compatible charger that supports a pre-charge or recovery mode; most will trickle current at a low rate until the cell voltage climbs back above 3.0V per cell, then switch to normal charge. If the charger shows no activity after 30 minutes at recovery current, the cells have dropped too far and the pack will not recover.

ATX1200 shuts down during USB data transfer to the controller unit

USB data transfer adds a combined load — the onboard processor, the radio module, and the USB bus draw simultaneously. On a partially discharged pack, that combined current pull can drag cell voltage below the BMS cutoff threshold momentarily, triggering a protective shutdown mid-transfer. This is not a faulty battery; it is a voltage sag event under peak load. Transfer data with the battery above 50% charge — on the ATX1200 that corresponds to a resting cell voltage above 3.7V per cell — and the shutdown will not recur.