JBL Go 3 Replacement Battery 3.7V 730mAh Li-Polymer MLP383562P

JBL Go 3 — 3.7V Li-Polymer Replacement Battery (MLP383562P)

This 3.7V, 730mAh Li-Polymer cell replaces the original MLP383562P battery in the JBL Go 3 Bluetooth speaker. It fits the compact Go 3 housing at 55.30 × 39.40 × 4.00mm and restores wireless audio playback when the original cell no longer holds charge. Voltage and capacity match OEM spec exactly.

• Go 3 cell fit: The Go 3 uses a flat Li-Polymer pouch cell with a specific footprint — this replacement matches that footprint and connector orientation so the BMS handshake completes without errors on power-up.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a Go 3 unit, confirmed the BMS accepted the cell immediately, and verified the fuel gauge tracked accurately across the full voltage range from 4.2V down to the 3.0V cutoff.
• Monthly discharge routine for Go 3: If the speaker sits on a desk and gets topped off constantly, run it down below 20% at least once a month before recharging — continuous shallow cycling without a full discharge causes fuel gauge drift and accelerates capacity fade on the Li-Polymer cell.

Why the Go 3 shows full charge but audio drops after extended play

An aged or deeply cycled Li-Polymer cell loses internal capacity while the fuel gauge still reads high. The speaker's BMS reads voltage, not true capacity, so a degraded cell can show three bars until the amplifier draws peak current and the cell collapses. That voltage sag trips the low-voltage cutoff, and the speaker shuts off or mutes — even though the indicator never reached empty. Replacing the cell resets the relationship between gauge reading and actual stored energy.

USB-C not waking a Go 3 that's been sitting discharged for weeks

If a Go 3 sits unused until the cell self-discharges below roughly 2.5V, the BMS enters deep-discharge lockout and the USB-C port won't initiate a charge session — the charger sees no handshake and delivers nothing. Plug in a 5V USB-C source and leave it connected for 15–20 minutes without interruption; the BMS trickle-charges the cell back above the acceptance threshold before switching to normal CC/CV charging. If the indicator light never appears after 30 minutes, the cell has dropped below recoverable voltage and needs replacement.