About this replacement
Cattron Theimeg LRC Series — 4.8V Ni-MH Replacement Battery (1BAT-7706-A201)
This is a 4.8V, 2500mAh Ni-MH replacement battery for the Cattron Theimeg LRC crane remote control system. It fits the LRC, LRC-L, LRC-M, and LRC-Mund wireless transmitters used to operate overhead cranes and hoists in industrial facilities. Capacity is sourced from the product specification — 2500mAh (12Wh).
- LRC platform fit: The LRC, LRC-L, LRC-M, and LRC-Mund share the same 4.8V battery rail, connector format, and pack dimensions (79.20 × 61.90 × 33.20 mm). All four models draw from the same BMS handshake spec, so one replacement covers the full LRC lineup without modification.
- Bench tested on actual hardware: We ran this cell pack through charge and discharge cycles on the LRC platform. The BMS accepted the pack without error flags, and the protection circuit responded correctly to both low-voltage cutoff and overcharge thresholds.
- Infrequent-use charging protocol: Crane remotes often sit idle for weeks between jobs. Put the battery on charge once a month even when the transmitter is not in use. Ni-MH cells left fully discharged for extended periods lose capacity through voltage reversal in individual cells — a condition that does not recover with normal charging.
Solenoid activation causing power dropout on the LRC transmitter
When the LRC transmitter sends a crane activation command, the radio module and internal relay draw a short inrush current spike. A worn or partially discharged Ni-MH pack may sag below the BMS undervoltage threshold during that spike, triggering a protection cutoff. The transmitter drops out mid-command — the crane stops responding even though the remote appeared to be on. Fitting a fully charged, full-capacity replacement pack eliminates the voltage sag and keeps the BMS above the cutoff floor during relay activation.
New battery installed but remote shows low battery immediately
Ni-MH cells are typically shipped at storage voltage — around 1.0–1.1V per cell — which puts a 4-cell pack at roughly 4.2–4.4V, below the LRC's full-charge threshold. The transmitter reads that voltage as low and flags it immediately after install. This is not a faulty battery. Connect the pack to the LRC charger and bring it to a full charge before first use — the indicator should clear once the pack reaches 4.8V nominal.