Cattron Theimeg BT923-00116 Crane Remote Replacement Battery 3.6V 2000mAh

Cattron Theimeg Excalibur / CT24-UB — 3.6V Ni-MH Replacement Battery (BT923-00116)

This is a 3.6V, 2000mAh Ni-MH battery for the Cattron Theimeg Excalibur and CT24-UB wireless pendant remote controls. These pendants are used by crane operators to command hoist and travel functions on the job site. It also cross-references OEM part numbers BAT-0000327 and 250806.

• Excalibur and CT24-UB compatibility: Both remotes run on the same 3.6V single-cell Ni-MH platform with the same connector footprint and BMS handshake requirements. One replacement covers both units without modification.
• Bench tested on actual hardware: We cycled this cell through repeated solenoid activation sequences on the bench. The BMS held stable under the inrush current spikes typical of relay and solenoid engagement — no mid-operation dropout observed across the test cycles.
• Storage voltage for infrequently used crane remotes: If a pendant sits unused for more than 30 days, charge it before returning it to service. Ni-MH cells self-discharge faster than Li-ion — a pendant left dormant for two to three months can drop low enough that the remote shows a low-battery alert immediately on startup, even with a fresh cell installed.

Power dropout during solenoid or relay activation on the Excalibur

When the Excalibur triggers a crane movement, the solenoid or relay draws a sharp inrush current for a fraction of a second. A degraded or deeply discharged cell cannot sustain voltage under that load spike, causing the remote to cut out momentarily or reset. This is not a transmitter fault — it is the cell voltage collapsing below the BMS cutoff threshold during peak draw. Fitting a fully charged 2000mAh cell resolves this; if dropout continues, confirm the cell is at or above 4.0V total terminal voltage before use.

Remote shows low battery immediately after new cell install

Ni-MH cells ship and store at a reduced voltage — typically 30–50% of full charge — to slow self-discharge during transit. When the Excalibur reads terminal voltage on startup, a cell at storage voltage registers as low and triggers the indicator before any real use occurs. This is not a faulty cell. Connect the pendant to its charger and run a full charge cycle before first use; the low-battery alert will clear once the cell reaches operating voltage.