Bose SoundLink 08319 Replacement Battery 3.7V 3350mAh

Bose 08319 — 3.7V Li-ion Replacement Battery (626161-1040)

This 3.7V, 3350mAh (12.4Wh) Li-ion cell replaces the original battery in the Bose SoundLink portable Bluetooth speaker, model 08319. It matches the OEM part number 626161-1040 and fits the speaker's battery bay without modification. Use this when the original cell no longer holds a charge or the speaker shuts off early into a session.

• SoundLink 08319 fit: The 08319 runs a single-cell 3.7V nominal Li-ion pack with a three-wire thermistor connection. This replacement matches that connector pinout and communicates correctly with the speaker's onboard BMS — no error codes or charge refusal at startup.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the 08319 platform and confirmed the BMS accepted the pack on first connect, held charge termination at 4.2V, and did not trigger over-current cutoff during high-volume audio draw.
• Monthly discharge cycle for the 08319: If the speaker sits on a desk and gets topped off constantly, let it run below 20% at least once a month before recharging — the 08319's fuel gauge calibrates on full-cycle data, and skipping this causes the charge indicator to read inaccurately within weeks.

Bluetooth dropping at high volume on the 08319

At maximum volume, the amplifier and Bluetooth radio draw current simultaneously, creating a combined spike the aging cell cannot sustain without voltage sag. When cell voltage dips below roughly 3.4V under that combined load, the radio stack resets to protect the amplifier circuit. The speaker reconnects within seconds, but the drop repeats if the cell is degraded. A fresh 3350mAh cell with lower internal resistance handles the peak draw without sagging past the radio's dropout threshold.

Audio distorting before the battery indicator reaches empty

This happens when the cell's internal resistance has risen enough that voltage sags under amplifier load — even though the resting voltage still reads as mid-charge. The amplifier clips because it cannot pull enough clean voltage during loud passages. The battery indicator lags because it reads resting voltage, not load voltage. Replacing the cell restores clean voltage delivery under load; confirm the fix by checking that audio stays clear down to the last indicator bar.