Cattron Theimeg BT923-00075 Crane Remote Replacement Battery 12V 2500mAh

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

This is a 12V, 2500mAh Ni-MH replacement battery for Cattron Theimeg wireless crane remote controls. It fits the Easy u. Mini, TH-EC 30 u. 40, TH-EC/LO, and Easy series remotes. Cross-references include BT923-00044, BT081-00061, and BT081-00053.

• Multi-model fit across TH-EC and Easy platforms: These remotes share the same 12V power rail, physical housing dimensions, and connector orientation. The BMS handshake protocol is consistent across TH-EC 30, TH-EC 40, TH-EC/LO, and both Easy variants, so a single cell pack covers all listed units.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on TH-EC series hardware. The BMS held charge voltage at 14.4V peak, and the cell pack delivered consistent output under simulated solenoid activation loads without triggering low-voltage cutoff.
• Monthly charge cycle for infrequent use: Crane remotes often sit unused for weeks between jobs. Ni-MH cells left uncharged below 10.5V for extended periods suffer accelerated capacity loss from self-discharge. Connect the charger for a full cycle once a month during idle periods to keep cell voltage above the recovery threshold.

Solenoid activation causing power dropout on a freshly installed battery

When a crane remote triggers a solenoid or contactor relay, the inrush current spike can exceed 3–5A for a brief window. A cell pack at storage voltage — typically around 12.0V — has higher internal resistance than a fully charged pack, which amplifies voltage sag during that spike. The BMS interprets this sag as an undervoltage fault and shuts down the output rail. Charging the pack to full before first use drops internal resistance and keeps the voltage above the BMS cutoff threshold during activation events.

Remote showing low battery immediately after new pack install

Ni-MH cells ship at approximately 40–60% charge — enough to power on, but not enough for the remote's battery indicator to show full. The low-battery warning on Cattron Theimeg remotes triggers below roughly 11.5V under load, and a partially charged new pack can sit right at that edge. This is not a faulty cell — it is a storage state. Run a full charge cycle before first use and verify the resting voltage reads at or above 13.2V before returning the remote to service.