Philips BT2200B Replacement Battery 3.7V 500mAh

Philips BT2200B — 3.7V Li-Polymer Replacement Battery (P682634)

This is a 3.7V 500mAh Li-Polymer cell for the Philips BT2200B and BT2200B/27 portable Bluetooth speaker. It replaces part number P682634 directly. Fit this battery when the original cell no longer holds charge through a normal listening session.

• BT2200B and BT2200B/27 compatibility: Both variants run the same 3.7V rail from an identical P682634 cell. The connector, cell dimensions (37.70 × 25.00 × 6.00mm), and BMS handshake are shared across both model suffixes — no hardware modification needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the BT2200B chassis. The BMS accepted the pack without fault codes, balanced correctly at 4.2V, and the protection circuit tripped at the expected low-voltage cutoff without requiring a manual reset.
• Fuel gauge calibration after install: After fitting a new cell, the BT2200B fuel gauge may read inaccurately for the first two or three cycles. Run the speaker down until it shuts off automatically, then charge uninterrupted to 100% each time — this resets the gauge baseline and prevents the speaker from reporting false-full states.

Audio distortion before the battery indicator reaches empty

As a degraded Li-Polymer cell ages, its internal resistance rises. Under the combined current draw of the amplifier and Bluetooth radio, cell voltage sags below what the amplifier needs to swing cleanly. The output stage clips before the protection circuit trips — you hear distortion while the indicator still shows charge remaining. Fitting a fresh cell with lower internal resistance restores clean voltage delivery to the amp stage and eliminates the clipping. If distortion persists on a new cell, check that the charging source delivers a stable 5V.

Speaker warm to the touch in its fabric housing during extended play

The BT2200B houses both the amplifier IC and the battery in a compact fabric-wrapped enclosure with limited airflow. Amplifier dissipation and battery discharge heat combine in that enclosed space, pushing operating temperature higher than either source alone would. On a degraded cell, higher internal resistance adds a third heat source — the cell itself generates more heat per milliamp drawn. If the speaker cuts out due to thermal protection on a new replacement cell, reduce continuous volume level and allow a short cool-down before resuming playback.