Jabra Engage 65 Replacement Battery 3.8V 100mAh

Jabra Engage 65 / Engage 65 Convertible — 3.8V Li-Polymer Replacement Battery (AHB701718HPJT)

This is a 3.8V, 100mAh Li-Polymer replacement battery for the Jabra Engage 65 and Engage 65 Convertible wireless DECT headsets. It replaces OEM part AHB701718HPJT and fits directly into the headset's small battery bay. Capacity is taken from product data — 100mAh (0.38Wh).

• Engage 65 and Engage 65 Convertible compatibility: Both headset variants run on the same 3.8V Li-Polymer cell with identical connector pinout and BMS handshake protocol. One part number covers both form factors.
• Bench tested on actual hardware: We cycled this battery through the Engage 65 base station and confirmed BMS handshake completion, stable charge termination voltage, and normal DECT radio behaviour under combined audio and wireless draw.
• First charge in base station: Place the headset in the base station and let it complete a full charge cycle before taking a call. The Engage 65 base needs to log the new cell to generate an accurate battery status indicator — skipping this step causes the charge display to read incorrectly for the first several sessions.

Base station not recognising a new pack after swap

When a fresh Li-Polymer cell arrives at storage voltage — typically around 3.6–3.7V — the Engage 65 base station may not immediately register it as a valid battery. The BMS handshake between the headset firmware and the base requires the cell voltage to climb past the recognition threshold before the status LED shifts from error to charging. If the base flashes an error or shows no charge activity, seat the headset firmly, leave it undisturbed for 10 minutes, then check again. A full trickle-in cycle from storage voltage resolves this in most cases.

Headset cuts out mid-call on a freshly installed battery

The Engage 65 draws simultaneously from the audio amplifier and the DECT radio module during active calls — a combined load that a cell at partial state of charge can fail to sustain. When voltage sags below the BMS cutoff threshold under this dual load, the headset shuts off abruptly mid-call even if the battery indicator showed adequate charge beforehand. This is not a faulty cell — it is a voltage sag event on a cell that has not yet been through a conditioning cycle. Run two to three full charge-and-use cycles and the discharge curve stabilises; the BMS will hold above cutoff voltage at 3.5V or above during normal call loads.