Divoom Timebox Mini 3.7V Replacement Battery 2600mAh

Divoom Timebox Mini — 3.7V Li-ion Replacement Battery

This is a 3.7V 2600mAh Li-ion cell for the Divoom Timebox Mini portable Bluetooth speaker. It fits both the Timebox Mini and Timebox-Mini variants. Swap it in when the original cell no longer holds a charge or the speaker shuts off before the indicator reaches empty.

• Timebox Mini and Timebox-Mini compatibility: Both model name variants use the same PCB layout, connector pin-out, and cell footprint — 68.00 × 18.70 × 18.90mm. The BMS handshake and charge IC are identical across both, so this cell works in either unit without modification.
• Bench tested on actual hardware: We cycled this cell through repeated charge and discharge loads that replicate the combined draw of the amplifier, LED matrix, and Bluetooth radio. The BMS held cutoff voltage at 2.75V and accepted charge from the onboard circuit without triggering protection flags.
• Fuel gauge recalibration after install: After fitting the new cell, run it down past 15% before the first full recharge. The Timebox Mini's fuel gauge IC calibrates its capacity register on the first full cycle — skipping this step causes the indicator to report inaccurate state-of-charge from day one.

Capacity fade from constant desk-top charging on the Timebox Mini

The Timebox Mini is often left plugged in at a desk, cycling between 95% and 100% repeatedly throughout the day. Li-ion cells held near full charge experience elevated cathode stress, which accelerates capacity loss faster than normal use cycling would. This is why a unit used daily at a desk can show significant capacity fade within six to twelve months even with low total play hours. To slow this, discharge the speaker below 20% at least once a month before reconnecting the charger.

Audio distorting before the battery indicator reaches empty

This happens when the cell's internal resistance has risen enough that the amplifier's current draw causes a sharp voltage sag — even though the resting voltage still reads mid-range. The amplifier clips because rail voltage drops below the threshold it needs to reproduce peaks cleanly. The display may still show two or three bars while the audio breaks up. If distortion starts above 3.5V under load, the cell has degraded and replacement is the fix.