JBL Go 2 Replacement Battery 3.7V 730mAh Li-Polymer

JBL Go 2 / Go 2H — 3.7V Li-Polymer Replacement Battery (MLP284154)

This 3.7V, 730mAh (2.7Wh) lithium-polymer cell replaces the original MLP284154 battery in the JBL Go 2 and Go 2H portable Bluetooth speakers. It fits directly behind the speaker grille assembly and connects to the same JST-style lead as the factory pack. When the original cell degrades and the speaker shuts off early or refuses to charge, this swap restores normal operation.

• Go 2 and Go 2H fitment: Both models use the same 56.80 × 40.00 × 3.00mm flat Li-Polymer pouch and share the MLP284154 part number. The BMS on each model reads the same voltage thresholds, so one cell covers both variants without firmware or connector changes.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a Go 2 unit. The BMS accepted the pack without fault codes, low-voltage cutoff triggered correctly at the expected floor, and the charge IC brought the cell to full voltage without thermal events.
• Go 2 discharge cycling: If you charge the speaker every night regardless of remaining charge, let it drop below 20% at least once a month before plugging in. Constant shallow top-off charging without a full discharge causes fuel gauge drift on the Go 2's charge IC, making the LED indicator unreliable and accelerating capacity fade in the pouch cell.

Audio distorting before the battery LED reaches empty on the Go 2

The Go 2 amplifier draws a sharp current spike at high volume. When the cell voltage sags under that spike, the amp clips before the protection circuit calls it empty. The LED still shows one bar, but the cell is already below the voltage the amplifier needs to drive clean output. Replacing an aged cell with a fresh 730mAh pack raises the resting voltage and tightens internal resistance, which reduces the sag under load. After fitting this cell, confirm the speaker reaches full charge — 4.2V at the pack — before first use.

Go 2 not waking from USB when deeply discharged

If the Go 2 sits unused for several weeks, the cell can drop below the minimum voltage the charge IC needs to begin a standard charge cycle. At that point, plugging in USB produces no LED response and the speaker stays off. The fix is to leave the cable connected for 15–20 minutes — the IC runs a low-current pre-charge trickle to bring the cell back above 3.0V before switching to normal CC/CV charging. If the LED still does not light after 30 minutes, check the cable and port, then confirm pack voltage with a multimeter at the JST connector; a reading below 2.5V means the cell is too far discharged to recover.