Harman/Kardon Esquire Mini 2 Li-Polymer Replacement Battery LI605447 3.8V 2100mAh

Harman/Kardon Esquire Mini 2 — 3.8V Li-Polymer Replacement Battery (LI605447)

This 3.8V, 2100mAh Li-Polymer cell replaces the original LI605447 battery in the Harman/Kardon Esquire Mini 2 portable Bluetooth speaker. It matches the OEM dimensions at 48.30 x 54.00 x 6.00mm, fitting the slim chassis without modification. If your Esquire Mini 2 no longer holds a charge or shuts off unexpectedly, this is a direct cell swap.

• Esquire Mini 2 fit: The LI605447 cell uses a specific footprint and connector orientation matched to the Mini 2 PCB. The BMS on this board handshakes with the cell to regulate charge termination at 4.2V — a mismatched cell can trigger false full-charge cutoffs before capacity is reached.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Esquire Mini 2 platform. The BMS accepted the cell without fault flags, and the fuel gauge tracked accurately across the full charge window from 3.0V to 4.2V.
• Shallow-cycle care for desk-use speakers: If the Esquire Mini 2 sits on a desk plugged in most of the day, run it down below 20% at least once a month before recharging. Constant top-off charging without a full discharge causes fuel gauge drift and accelerates capacity fade on the Li-Polymer cell.

Capacity fade from constant desk-top charging on the Esquire Mini 2

Li-Polymer cells degrade faster when kept near full charge continuously. The Esquire Mini 2 is often used as a desktop speaker with USB-C connected most of the time, which keeps the cell sitting at 4.2V for hours. That sustained high-voltage state stresses the cathode material and reduces usable capacity over months. To slow this, unplug the speaker once it hits full charge and let it discharge naturally during use before reconnecting power.

Audio distorting before the battery indicator reaches empty

This happens when the cell's internal resistance has risen enough to cause voltage sag under amplifier load. At high volume, the amp pulls a current spike that drops the cell voltage momentarily below the point where the amplifier can maintain clean output — you hear clipping or distortion even though the indicator still shows charge remaining. The battery isn't empty; it just can't deliver current fast enough without sagging. Replacing the cell with a fresh LI605447 restores the low internal resistance needed to hold voltage above 3.5V under load.