Ikusi TM70/3 Crane Remote Replacement Battery 4.8V BT24IK

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

This is a 4.8V 2500mAh Ni-MH battery for Ikusi TM70/3, TM70/8, IK3, and T70/3 transmitters used in industrial crane and hoist operations. It replaces OEM part numbers BT24IK, 2305271, and BT27iK-1. Voltage and cell count match the original battery pack exactly.

• TM70 and IK3 transmitter platform: These transmitters share the same 4.8V four-cell Ni-MH architecture, connector footprint, and BMS handshake protocol. Swapping between compatible models on this platform requires no modification.
• Bench tested on actual hardware: We ran this cell pack through charge and discharge cycles on a TM70-series transmitter. The BMS accepted the charge profile without fault flags, and voltage held steady through repeated solenoid activation cycles.
• Storage charge for infrequent crane use: Crane remotes often sit unused for weeks between jobs. Cycle a full charge into this battery at least once a month during idle periods. Ni-MH cells discharged below their recovery threshold can lose capacity permanently — monthly charging prevents this.

Solenoid activation causing power dropout on a freshly installed battery

When a crane remote activates a solenoid or relay, it draws a sharp inrush current that can spike well beyond steady-state load. If the battery is at storage voltage rather than full charge, the cell voltage sags under that inrush and the BMS interprets it as an undervoltage fault. The transmitter cuts out mid-command — which looks like a dead battery even on a new pack. Always charge the battery to full before first use on a TM70-series transmitter. A fully charged Ni-MH pack at 4.8V nominal handles inrush without triggering BMS cutoff.

Remote showing low battery immediately after swapping in a new cell

A new Ni-MH battery ships at storage voltage — typically 3.8V to 4.2V for a four-cell pack — not at operational full charge. The TM70's battery indicator reads that reduced voltage as low and flags it immediately. This is not a fault with the battery. Connect the transmitter to its charger and bring the pack to a full 5.6–5.8V open-circuit voltage before use. The low-battery warning will clear once the cells are fully charged.