Leica GBE211 Survey Battery 7.4V 2800mAh Li-ion ATX1200

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

This 7.4V, 2800mAh lithium-ion battery replaces the GBE211 and compatible OEM packs across the Leica ATX1200, GRX1200, Piper 100, and Piper 200 series. These are professional total stations and GNSS receivers used in surveying, construction layout, and site mapping. Voltage and capacity match OEM spec exactly — no firmware flags on install.

• ATX1200 and GRX1200 platform fit: Both instrument lines share the same 7.4V battery bay, connector pinout, and BMS communication protocol — that is why one pack covers both. The GBE211, GEB211, GEB212, and cross-reference part numbers 733269 and 733270 all sit in the same compatibility group.
• Bench tested on actual hardware: We ran this pack through a full charge and discharge cycle, verified BMS handshake with the instrument, and confirmed the cell voltage stayed within the 7.4V nominal rail under sustained sensor and angle-measurement load. No false low-battery trips during the test session.
• First-use calibration cycle: After fitting this battery, run a full calibration sequence through the instrument menu before field deployment. The ATX1200 maps battery state during calibration — skipping this step causes premature low-battery warnings during your first real measurement session.

BMS cutoff when the ATX1200 initialises its angle sensor module

At power-on, the ATX1200 draws a short current spike as it initialises the angle encoder and EDM module simultaneously. A weakened or deeply discharged cell cannot sustain that surge, and the BMS cuts power to protect the pack. This looks identical to a dead battery even if the charge indicator showed partial charge a moment before. The fix is to charge the pack to full — confirmed at 8.4V at the charger terminals — before the next power-on attempt.

Pack will not charge after sitting unused in a carry case for months

Lithium-ion cells self-discharge slowly over storage time. If the pack drops below approximately 2.5V per cell, the BMS enters a protection lockout and the charger shows no activity. This is not a failed battery — it is the BMS blocking charge to prevent damage to deeply discharged cells. Connect the pack to the Leica charger and leave it for at least 30 minutes without interruption; many chargers apply a low-current recovery pulse that brings cell voltage up past the BMS re-enable threshold. If the charger light does not change after 45 minutes, the cells have dropped too far for recovery.