About this replacement
Anker PowerConf USB-C Conference Speaker — 3.7V Li-ion Replacement Battery (539028)
This is a 3.7V, 6700mAh Li-ion replacement battery for the Anker PowerConf USB-C Conference Speaker. It fits models A3301011 and A3305. OEM part number 539028 matches the original cell specification at 24.79Wh.
- A3301011 and A3305 compatibility: Both models share the same 3.7V battery rail, connector pinout, and BMS communication protocol. A single cell revision covers the full PowerConf USB-C lineup without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a PowerConf unit. The BMS handshake completed correctly, charging terminated at full voltage, and the unit's LED indicators reported charge state accurately after one full cycle.
- First-session calibration tip: After installing, run a complete charge cycle before using the unit in a meeting. The PowerConf maps battery state during normal operation — the charge indicator may show inaccurate warnings for the first session until the firmware establishes its voltage thresholds against the new cell.
Battery indicator showing wrong level after installation
The PowerConf's fuel gauge estimates charge state by tracking voltage curves it learned from the previous cell. A new cell with a full 6700mAh capacity sits on a slightly different voltage curve than a degraded original. The firmware needs one full charge-to-discharge cycle to recalibrate its thresholds. Charge the unit to 100%, use it until it prompts a recharge, then charge again — the indicator will read accurately from that point forward.
Unit cutting out or losing audio mid-conference call
The PowerConf draws simultaneously from the battery for the speaker amplifier, microphone array, and USB-C audio processing. Under sustained combined load — especially at higher speaker volumes during long sessions — voltage can sag briefly below the BMS protection threshold, triggering a cutoff. This typically points to a cell that has lost usable capacity rather than a firmware fault. Replacing the cell with a fresh 6700mAh unit restores the voltage headroom needed to sustain peak draw without tripping the protection circuit.