Listen Technologies AHB623450PJT Audio Guide Replacement Battery 3.7V 1100mAh

Listen Technologies Audio Guide / LBT-1300 — 3.7V Li-Polymer Replacement Battery (AHB623450PJT)

This 3.7V, 1100mAh Li-Polymer cell replaces part number AHB623450PJT in the Listen Technologies Audio Guide and LBT-1300 wireless receiver. The Audio Guide is a compact portable audio receiver used in museums, guided tours, and educational venues. When the original cell degrades and the unit no longer holds adequate charge through a full tour, this cell restores full capacity.

• Audio Guide and LBT-1300 compatibility: Both models use the same AHB623450PJT cell, identical connector pinout, and the same BMS handshake protocol. The physical dimensions — 51.65 × 33.40 × 5.80mm — match the housing cavity exactly, so no fitting modifications are needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the LBT-1300 platform. The BMS completed handshake without error flags, and the charging circuit accepted the pack without interruption across multiple cycles.
• First-cycle charging on the tour dock: Place the unit in the charging dock and let it complete one full uninterrupted charge cycle before deploying it on a tour. The LBT-1300 dock logs the new cell's state-of-charge baseline on that first cycle — skipping it causes the charge indicator to read inaccurately in the field.

Why the LBT-1300 cuts out mid-tour on a new battery

The Audio Guide draws current from two loads simultaneously — the audio decoding circuit and the RF receiver. Under combined load, a cell at storage voltage (typically around 3.6–3.7V) can sag below the BMS cutoff threshold briefly, triggering a shutdown even though the pack reads as charged. This is not a fault in the cell. Running one full charge-discharge cycle through the dock brings the cell to its operational voltage range and eliminates the sag-induced cutoff in normal use.

Dock showing full charge but unit shuts off after a few minutes

This happens when a replacement cell ships at storage voltage and the dock's charge indicator reads state-of-charge from a BMS register rather than measuring a true full charge. The dock sees the cell above its minimum threshold and flags it as full before an actual charge cycle completes. Pull the unit, power it off completely, reseat it in the dock, and allow a full uninterrupted charge cycle to run. After that cycle, the dock and BMS register will be synchronised and the unit will operate normally at 3.7V rated voltage.