Jabra Elite 85t Charging Case Replacement Battery 3.8V 750mAh

Jabra Elite 85t Charging Case — 3.8V Li-Polymer Replacement Battery (PL902232V)

This 3.8V, 750mAh Li-Polymer cell replaces the internal battery inside the Jabra Elite 85t Charging Case. It fits the wireless charging dock that keeps the Elite 85t earbuds topped up between AC charges. When the case stops holding a charge, this cell is the direct fix.

• Elite 85t Charging Case fit: The Elite 85t case uses a compact Li-Polymer cell with a specific connector pinout and BMS communication line. This replacement matches the original cell's footprint at 34.00 × 22.00 × 8.50mm, voltage rail, and connector — so the case firmware reads it without a handshake error.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Elite 85t case. The BMS accepted the pack cleanly on first connection, the charge indicator lit normally, and the case passed current to both earbud charging contacts without fault.
• First-cycle protocol for the Elite 85t case: After fitting the new cell, place the case on AC charge with the lid closed and no earbuds inside. Let it run a full uninterrupted cycle before inserting the earbuds — this lets the case firmware calibrate the new cell's capacity baseline before it begins sharing load with the earbud contacts.

Why the Elite 85t case shows full charge but earbuds cut off after short use

A new or deeply discharged cell often sits at storage voltage — around 3.6V — when first installed. The case firmware reads that as a partial charge and reports a misleading status on the LED indicator. The earbuds draw current through the case's output rail, and when that rail dips under load, the BMS trips the cutoff before the indicator has updated. One full AC charge cycle from storage voltage resets the firmware's state-of-charge register and clears the mismatch.

Case LED blinking fault after new cell installation

A blinking fault LED on the Elite 85t case after a cell swap usually means the BMS handshake didn't complete on first connection. This happens when the cell voltage is below the case's minimum acceptance threshold — typically under 3.5V. Connect the case to AC power immediately after installation and leave it for at least 15 minutes before checking the LED again. If the fault clears and steady charging resumes, the BMS has accepted the pack; if not, reseat the connector and repeat from 3.5V pre-charge via AC.