Poly Savi 7200 Office Replacement Battery 3.7V 240mAh

Poly Savi 7200 Series — 3.7V Li-Polymer Replacement Battery

This 3.7V, 240mAh (0.89Wh) lithium-polymer cell replaces the internal battery in the Poly Savi 7200, Savi 7200 Office, Savi 7210 Office, and Savi 7220 Office DECT wireless headsets. The original cell degrades over time, cutting talk time short before the workday ends. This replacement restores the headset to normal operation at the correct voltage and capacity.

• Savi 7200 series fit: The 7200, 7200 Office, 7210 Office, and 7220 Office share the same headset housing, connector pinout, and 3.7V cell format. The BMS handshake runs through the same charge circuit across all four variants, so one cell fits the entire group.
• Bench tested on actual hardware: We cycled this cell through the Savi base station charge circuit and confirmed BMS communication, correct charge termination, and stable voltage under combined DECT radio and audio draw without premature cutoff.
• First-cycle base station protocol: Seat the headset in the base station and allow a complete uninterrupted charge cycle before taking a call. The DECT base logs the new cell during this cycle — skipping it causes the talk-time indicator to read inaccurately for several sessions.

Why the Savi 7200 cuts out mid-call even with a new battery seated

The Savi 7200 draws current from two sources simultaneously — the audio codec and the DECT radio. Under sustained combined load, a cell that has not completed its first full charge cycle can sag below the BMS cutoff threshold, dropping the headset off the call. This is not a fault with the cell itself. A complete first charge from the base station brings the cell to 4.2V and allows the BMS to set its low-voltage floor correctly. After one full cycle, mid-call dropout caused by voltage sag resolves.

Base station shows full charge but headset stops working after a few minutes

A replacement cell ships at storage voltage — typically around 3.6–3.7V — not at full charge. If the base station LED cycles to green quickly, it has read the incoming voltage as near-full and terminated charge early. The cell is not actually at capacity. Place the headset back in the base and leave it for a full charge cycle — most Savi bases take approximately 90 minutes to reach true termination from storage voltage. Once the cell reaches 4.2V and the base terminates correctly, runtime returns to rated capacity.