Croove Voice Amplifier Replacement Battery 3.7V 2600mAh

Croove Voice Amplifier — 3.7V Li-ion Replacement Battery (B0143KH9KG)

This 3.7V 2600mAh Li-ion cell replaces the original battery in the Croove Voice Amplifier. It fits the portable amplifier unit used for teaching, presentations, and outdoor announcements. Capacity is 9.62Wh — matched to the original specification.

• Croove Voice Amplifier fit: The Croove Voice Amplifier runs on a single-cell 3.7V Li-ion pack with a compact form factor — 65.60 × 22.30 × 18.40mm. This cell matches that envelope exactly, so the connector seats without modification and the BMS recognises the cell state on first boot.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a 3.7V single-cell platform. The BMS handshake completed without error on each cycle, and the cell held steady voltage delivery across moderate and high audio output loads without triggering premature cutoff.
• First-cycle volume discipline: Run the amplifier at 50% volume for the first full charge cycle. Full-volume operation on an uncalibrated cell pulls peak current before the cell has established its delivery baseline — this can trip the BMS short of rated capacity and permanently anchor the usable range lower than it should be.

Amp shutting off before the battery indicator reaches empty

The Croove amplifier's low-voltage cutoff sits higher than the display's empty marker. The indicator reads the cell voltage against a general discharge curve, but the amplifier's audio circuit pulls the actual terminal voltage below that threshold under load before the display catches up. The result is a sudden shutdown that looks premature. To reset this, charge the cell fully to 4.2V, then run one complete discharge cycle at moderate volume — this gives the BMS a clean reference point to recalibrate the cutoff against actual load voltage.

Audio clipping at moderate volume on a freshly installed cell

Clipping on a new cell usually points to voltage sag, not an amplifier fault. Under audio transients — sharp consonants, microphone peaks — the cell's internal resistance causes a brief voltage dip that pushes the amplifier's power rail below the clean-output threshold. A cell that hasn't completed its first full cycle has higher internal resistance than rated. Run two full charge-discharge cycles at 50% volume before using the amplifier at high output, and check that the terminal voltage under load stays above 3.5V.