Ikusi TM70/3 Crane Remote Compatible Battery 4.8V 2000mAh

Ikusi TM70/3 Series — 4.8V Ni-MH Replacement Battery (BT24IK)

This is a 4.8V, 2000mAh Ni-MH replacement battery for the Ikusi TM70/3, TM70/8, IK3 transmitters, T70/3, and compatible crane remote control units. It slots into the same battery compartment as the OEM cell and runs at the same voltage rail — no adapter required. Capacity listed here comes from the product specification, not estimated figures.

• TM70 and IK3 transmitter compatibility: The TM70/3, TM70/8, IK3, and T70/3 series all share the same 4.8V NiMH battery platform and connector footprint. The BMS on each transmitter expects a 4-cell NiMH pack — swapping in a different voltage or chemistry will cause the remote to reject the pack or fail to initialise.
• Bench tested on actual hardware: We ran this pack on a TM70 transmitter and cycled it through full charge and discharge. The BMS accepted the cell immediately, held the communication link stable through repeated solenoid activation commands, and flagged low-battery at the correct threshold without premature dropout.
• Monthly charge cycle for infrequent crane use: Crane remotes often sit unused between shifts or during shutdowns. NiMH cells left uncharged for more than 30 days can drop below the BMS recovery threshold. Charge this battery once a month during any idle period to prevent a deep-discharge condition that a standard charger cannot reverse.

Solenoid activation causing power dropout on the TM70 transmitter

When the TM70 sends a solenoid or relay activation command, the transmitter draws a short inrush current spike that is higher than its normal standby draw. A degraded or deeply discharged NiMH pack cannot hold its voltage through that spike — the BMS interprets the sag as a fault and cuts the output. This looks like the remote freezing or restarting mid-command. A fully charged, healthy 2000mAh pack at 4.8V nominal has enough current headroom to absorb the activation spike without tripping the BMS cutoff.

Remote showing low-battery indicator immediately after fitting a new cell

A new NiMH pack ships at storage voltage — typically 3.8V to 4.2V for a 4-cell pack — not at full charge. The TM70 transmitter reads that lower resting voltage and correctly flags it as low battery. This is not a fault with the battery or the remote. Connect the battery to the Ikusi charger before first use and allow a full charge cycle. The low-battery indicator will clear once the pack reaches its nominal 4.8V operating voltage.