Cattron Theimeg TH-EC/LO Replacement Battery 10.8V 2000mAh

Cattron Theimeg TH-EC/LO — 10.8V Ni-MH Replacement Battery (BT081-00053)

This is a 10.8V, 2000mAh Ni-MH battery for the Cattron Theimeg TH-EC/LO wireless crane remote control system. It replaces OEM part numbers BT081-00053, BT081-00061, and B5018-00061. Voltage and cell chemistry match the original spec exactly.

• TH-EC/LO platform fit: The TH-EC/LO crane remote draws from a tightly regulated 10.8V rail to manage radio transmission, solenoid feedback, and E-stop signalling on a shared power bus. A cell chemistry mismatch here will trip the onboard voltage regulator during transmission bursts.
• Bench tested on actual hardware: We ran this battery through full charge and load cycles on TH-EC/LO hardware. The BMS accepted the cell pack without fault codes, and voltage held stable across repeated solenoid activation sequences without dropout.
• Monthly charge cycle during idle periods: Crane remotes often sit unused for weeks between jobs. Ni-MH cells self-discharge at roughly 20–30% per month — if the pack drops too low, the TH-EC/LO's low-voltage cutoff activates and the remote will not power on even with a charger connected. Charge once a month during storage periods.

Solenoid activation causing power dropout on the TH-EC/LO

When a crane remote activates a solenoid or relay, it draws a short inrush current spike well above the steady-state load. On the TH-EC/LO, this spike is routed through the same battery bus as the radio module. If the battery's internal resistance is high — common in aged or deeply discharged Ni-MH cells — voltage sags sharply during activation and the remote's BMS interprets this as a critical low-voltage event, cutting power. The fix is a fully charged, healthy cell pack. Check resting voltage before use — a fresh 10.8V Ni-MH pack should read between 12.0V and 13.2V fully charged across 9 cells.

Remote showing low battery indicator immediately after installing a new pack

Ni-MH batteries ship at storage voltage — typically 60–70% of rated capacity — not at full charge. The TH-EC/LO reads cell voltage on boot, and a pack at storage voltage will trigger the low battery indicator before you've pressed a single button. This is not a fault with the battery. Connect the remote to its charger for a full charge cycle before first use. Once charged, resting voltage should return to the 12.0–13.2V range and the low battery indicator will clear.