Cattron Theimeg BT923-00075 12V Crane Remote Replacement Battery 2000mAh

Cattron Theimeg Easy u. Mini / TH-EC Series — 12V Ni-MH Replacement Battery (BT923-00075)

This is a 12V 2000mAh Ni-MH replacement battery for Cattron Theimeg crane and hoist remote controls. It fits the Easy u. Mini, TH-EC 30 u. 40, TH-EC/LO, and Easy series handsets. Sourced to match the original BT923-00075 specification, including physical dimensions of 112.75 x 59.50 x 36.30mm.

• Cross-compatible across TH-EC and Easy platform remotes: The Easy u. Mini, TH-EC 30 u. 40, and TH-EC/LO all run the same 12V battery rail and share the same connector and bay dimensions. One cell covers all of them without adapters or modifications.
• Bench tested on actual hardware: We cycled this battery through full charge and load discharge on TH-EC platform hardware. The BMS held stable through repeated solenoid-activation spikes, and cell balance remained within spec across five full cycles.
• Monthly charge during idle storage: Crane remotes often sit unused for weeks between jobs. Ni-MH cells self-discharge at roughly 20–30% per month. Top up the charge every four weeks during idle periods or the cells will drop into a deep-discharge state that a standard charger may not recover.

Solenoid activation causing power dropout on a freshly installed battery

When the remote triggers a crane solenoid or relay, the inrush current spikes sharply for 20–50 milliseconds. A battery at low state of charge cannot sustain the voltage through that spike, and the remote's processor resets mid-command. This looks like a lockout or freeze but it is a voltage-sag event. Always charge the battery fully before returning a remote to service after any swap or storage period. A fully charged 12V Ni-MH pack should read 13.2–14.4V immediately off the charger.

Remote showing low battery warning immediately after a new cell is installed

Ni-MH cells ship and store at approximately 50–60% state of charge, not full. The remote's voltage threshold reads this as a low-battery condition because it is one. This is not a faulty cell. Connect the battery to the original Cattron Theimeg charger and run a full charge cycle before powering the remote. A complete charge on a 2000mAh Ni-MH pack at standard 200mA charge rate takes roughly 12–15 hours — use the manufacturer charger, not a generic one, to avoid overcharge on Ni-MH chemistry.