Creative MUVO Go 7.4V 2600mAh Replacement Battery JY18650-2S

Creative MUVO Go / MF8405 — 7.4V Li-ion Replacement Battery (JY18650-2S)

This is a 7.4V 2600mAh Li-ion replacement battery for the Creative MUVO Go portable Bluetooth speaker (model MF8405). It uses OEM part number JY18650-2S and fits the compact dual-cell battery bay inside the MUVO Go chassis. Capacity is 19.24Wh, matching the original specification from Creative.

• MUVO Go and MF8405 compatibility: Both model references point to the same hardware platform. They share the same 7.4V two-cell serial arrangement, the same physical footprint (67.10 × 36.90 × 21.20mm), and the same BMS handshake profile. A battery sourced for one fits the other without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the MUVO Go board. The BMS engaged correctly at both low-voltage cutoff and full-charge termination. Cell balance across the two 18650 cells held within 20mV through five consecutive cycles.
• Monthly discharge cycle for the MUVO Go: The MUVO Go spends most of its life on a desk, topped off before it drops below 50%. Run it down below 20% at least once a month before recharging. Without that full discharge cycle, the fuel gauge drifts and the speaker reports full charge while actual usable capacity shrinks.

Why the MUVO Go shows full charge but audio cuts out after extended play

The MUVO Go's fuel gauge reads state-of-charge from a coulomb counter, not a direct cell voltage measurement. After hundreds of shallow top-off cycles, the counter loses calibration and overstates remaining capacity. The speaker appears fully charged but the actual cell voltage drops under amplifier load faster than the indicator tracks. A full discharge to below 20% followed by an uninterrupted charge to 100% recalibrates the counter and restores accurate reporting.

Audio distorting before the battery indicator reaches empty

When the MUVO Go's combined amplifier and Bluetooth radio draw spikes under loud audio, pack voltage sags momentarily below the amplifier's clean operating floor. The result is clipping distortion even though the battery indicator still shows charge remaining. This is voltage sag under load, not a capacity issue. On a degraded original battery it starts happening above 60% volume — a replacement pack with healthy internal resistance pushes that threshold back toward the original spec.