Phonak iCube 1 Wireless Programmer Compatible Battery 3.7V 250mAh

Phonak iCube 1 Wireless Hearing Aid Programmer — 3.7V Li-Polymer Replacement Battery (453329)

This 3.7V, 250mAh lithium-polymer cell replaces the original battery in the Phonak iCube 1 Wireless Hearing Aid Programmer. The iCube 1 is a wireless programming device used by audiologists and hearing aid wearers to adjust hearing aid settings over a short-range radio link. When the original cell degrades and can no longer sustain a session, this replacement restores full function.

• iCube 1 programmer fit: The iCube 1 runs a combined load — wireless radio transmission and onboard firmware — from a single compact cell. The 453329 cell matches the voltage rail and connector spec the programmer's BMS expects, so the device registers a valid pack on power-up without throwing a charge fault.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the bench. The BMS accepted the pack, completed a full charge cycle without error, and held voltage within the expected 3.7V nominal range under combined radio and logic draw.
• First-session conditioning on the iCube 1: Charge the iCube 1 fully via its dock before running your first programming session. The device's charge controller needs one complete cycle to calibrate the state-of-charge display against the new cell — sessions run before that cycle may show an inaccurate battery indicator.

Why the iCube 1 drops its wireless link mid-programming session

The iCube 1 transmits to hearing aids over a short-range radio protocol while simultaneously running its onboard logic. That combined draw spikes current demand in short bursts. A degraded or deeply discharged cell sags below the BMS cutoff voltage during these spikes, and the programmer drops the wireless link before the session completes. A fresh cell at full charge sustains voltage through those bursts and keeps the link stable for the duration of a session.

iCube 1 shows full charge on the dock but cuts off seconds after undocking

This happens when the replacement cell arrives at storage voltage — typically around 3.6V — and the dock registers it as charged without pushing a full cycle. The BMS then cuts the device off almost immediately once real load is applied. The fix is to leave the iCube 1 seated in the dock for a complete charge cycle, confirmed by the charge indicator returning to full from a charge state, before using the device. After that first full cycle the cell will deliver its rated 250mAh under normal load.