Ikusi BT11K Crane Remote Replacement Battery 3.7V 1100mAh

Ikusi T70/2 Series — 3.7V Li-ion Replacement Battery (BT11K)

This is a 3.7V, 1100mAh Li-ion replacement battery for Ikusi crane remote controls using the BT11K cell. It fits the T70/2, T70/2 iKontrol, IK2, and PUPITRE IK2 remotes. These are handheld industrial wireless transmitters used to operate overhead cranes and hoists from ground level.

• T70/2 and IK2 platform compatibility: All four fit models share the same 3.7V single-cell architecture and BT11K form factor. The BMS handshake and connector pinout are identical across the T70/2, T70/2 iKontrol, IK2, and PUPITRE IK2 — one cell covers the full range.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the T70/2 platform. The BMS accepted the cell without fault codes, held stable voltage under simulated solenoid activation, and cut off cleanly at the low-voltage threshold.
• Monthly charge during idle periods: Crane remotes often sit unused for weeks between jobs. If the cell drops below 2.5V, the BMS enters deep-discharge lockout and the remote will not power on even with a charger connected. Charge the battery once a month during any extended idle period to prevent this.

Solenoid activation causing power dropout on a freshly installed BT11K

When an operator triggers a crane movement command, the remote's internal relay or solenoid draws a short inrush current spike. If the replacement cell is at storage voltage rather than full charge, that spike can push the BMS over its overcurrent threshold and trip a temporary cutoff. The remote appears to die mid-command, then recovers after a few seconds. Fully charging the cell before first use keeps the internal voltage high enough that the BMS handles the inrush without tripping.

Remote showing low battery warning immediately after new cell install

Li-ion cells ship at approximately 3.6–3.7V storage charge — below the 4.2V full-charge threshold. The T70/2 firmware reads cell voltage directly and flags anything under its low-battery threshold as a warning, even on a brand-new cell. This is not a faulty battery. Connect the remote to its charger and bring the cell to 4.2V before putting the remote back into service.