About this replacement
Leica TPS100 / TCA1800 / TC2003 Series — 12V Ni-MH Replacement Battery (GEB70 / 402210)
This is a 12V 4000mAh Ni-MH replacement for the Leica GEB70 battery pack. It fits the TPS100, TCA1800, and TC2003 total station series used in field surveying and construction layout work. Voltage, connector, and housing dimensions match the original specification — 180.14 × 75.90 × 61.28mm.
- TPS100, TCA1800, and TC2003 compatibility: These instruments share the same battery bay geometry, 12V rail, and GEB70 connector standard. One pack fits all three without modification or adapter.
- Bench tested on actual hardware: We cycled this pack through the TPS100 power-up sequence and ran sustained EDM and angle measurement loads. The BMS held voltage within tolerance across the full draw cycle and did not trip on motor-drive initialisation.
- First field deployment prep: After installing, run a full calibration cycle through the instrument menu before heading to site. The TPS100 maps battery state during calibration — skipping this step causes premature low-battery warnings to appear during the first measurement session, even with a fully charged pack.
BMS cutoff when the TPS100 initialises its EDM or servo drive
On power-up, the TPS100 fires the EDM module and initialises the servo drive in rapid sequence. That combined inrush current can exceed 2A for a fraction of a second — enough to trip a weak or partially discharged Ni-MH pack at its protection threshold. The result is an immediate shutdown that looks like a faulty battery rather than a current spike. This pack is rated to handle that initialisation draw without cutoff. If shutdowns persist on an older pack, check resting voltage — anything below 10.5V under no load indicates a degraded cell group that will not recover under charge.
Instrument not recognising the new pack after the battery has sat unused for months
Ni-MH cells self-discharge at roughly 1–3% per day. A pack stored for three or more months can drop below the voltage floor the TPS100's charge circuit uses to detect a connected battery. The instrument either shows no charge indicator or starts a charge cycle that stops almost immediately. To recover, connect the pack to the Leica GKL112 or GKL122 charger and allow it to run a full conditioning cycle — do not pull it early. Once cell voltage rises above approximately 10.8V, the instrument charge circuit will recognise the pack and complete charging normally.