William Sound Sorin WS-BATPACK Replacement Battery 7.4V 1800mAh

William Sound Sorin — 7.4V Li-ion Replacement Battery (WS-BATPACK)

This is a 7.4V, 1800mAh Li-ion battery pack for the William Sound Sorin portable amplifier. It slots directly into the Sorin to restore cordless audio amplification when the original pack can no longer hold a usable charge. Voltage and capacity match the OEM specification exactly.

• Sorin amplifier compatibility: The Sorin uses a dedicated battery bay keyed to the WS-BATPACK form factor. The BMS inside this pack communicates with the Sorin's power management circuit at the same voltage thresholds as the original, so the battery indicator and protection cutoffs behave as expected.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a Sorin unit and confirmed the BMS held the charge rail steady under sustained audio output. No nuisance cutoffs occurred during normal operation.
• First-cycle conditioning on the Sorin: Run the amplifier at around 50% volume for the first full charge cycle. Full-volume operation on an uncalibrated cell draws peak current before the cell has reached its rated delivery capacity, which can trigger an early BMS trip and skew the state-of-charge reading for subsequent cycles.

Sorin shutting off before the battery indicator reaches empty

The Sorin's amplifier circuit requires a minimum rail voltage to keep audio output clean and stable. If the battery's resting voltage reads 7.4V but sags under load, the amplifier hits its undervoltage threshold before the display catches up. This is a load-vs-display lag, not a faulty pack. To verify, charge the battery fully, run the Sorin at moderate volume, and check whether the indicator aligns better with shutoff — a calibrated cell should bring these closer together after two or three full cycles.

Audio clipping or distortion on a freshly charged Sorin battery

Clipping at moderate volume on a new pack usually means the BMS is briefly throttling current during transient audio peaks — sharp consonants and bass hits pull short, high-current spikes that an unconditioned cell handles less smoothly. The BMS interprets these spikes as an overload and momentarily limits output, which the amplifier renders as clipping. After two or three full charge-discharge cycles the cell's internal resistance drops and transient delivery improves. If clipping persists past three cycles, check that the pack voltage reads at least 8.3V immediately after a full charge.