BT923-00071 Cattron Theimeg Handy Replacement Battery 7.2V 2000mAh

Cattron Theimeg Handy / TC100 Series — 7.2V Ni-MH Replacement Battery (BT923-00071)

This 7.2V, 2000mAh Ni-MH battery replaces the OEM pack in Cattron Theimeg Handy, HANDY Control II, HANDY Control III, and TC100 crane remote controls. It matches the original voltage rail and connector configuration for these industrial wireless hoist remotes. Capacity is sourced from product data at 14.4Wh.

• Handy and TC100 platform compatibility: The Handy, HANDY Control II, HANDY Control III, and TC100 all share the same 7.2V battery bay geometry and BMS handshake protocol. Swapping between these models requires no wiring changes — the connector and retention tab position are identical across the platform.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a TC100 remote. The BMS accepted the pack without a fault flag, and solenoid activation during load testing produced no voltage dropout at the output terminals.
• Monthly charge cycle for infrequently used remotes: Crane remotes on job sites often sit idle for weeks between shifts. Ni-MH cells in this pack self-discharge faster than Li-ion equivalents — charge the battery once a month during idle periods to prevent the cell voltage from dropping below the BMS recovery threshold.

Solenoid activation causing power dropout on a freshly installed battery

When a crane remote triggers a solenoid or relay, the inrush current spikes sharply for a fraction of a second. A battery at storage voltage — typically around 6.0V for a 7.2V Ni-MH pack — cannot sustain that draw, and the BMS interprets the voltage sag as an unsafe condition and cuts output. This is not a fault in the battery or the remote. The fix is to charge the pack fully before first use. A full charge brings cell voltage to approximately 8.4V, which gives the BMS enough headroom to absorb the solenoid inrush without tripping.

Remote showing "low battery" immediately after a new pack is installed

This symptom almost always means the replacement battery arrived at shipping or storage voltage, not at full charge. The Handy remote reads cell voltage at startup and flags anything below its low-battery threshold — typically around 6.6V for this chemistry. The pack is not defective; it just needs a full charge cycle before use. Connect it to the OEM charger and allow a complete charge before powering the remote on.