JBL Flip 2 Replacement Battery 3.7V 2000mAh Li-Polymer AEC653055-2P

JBL Flip 2 (2013) — 3.7V Li-Polymer Replacement Battery (AEC653055-2P)

This is a 3.7V, 2000mAh Li-Polymer replacement battery for the JBL Flip 2 (2013) portable Bluetooth speaker. It replaces part number AEC653055-2P and fits both the Flip 2 and Flip II (2013) variants. Use this when the original cell no longer holds a charge or the speaker shuts down unexpectedly under audio load.

• Flip 2 and Flip II (2013) compatibility: Both the Flip 2 and Flip II use the same single-cell 3.7V Li-Polymer pack with identical connector pinout and BMS handshake. Swapping between these two model names carries no electrical risk — the hardware is the same.
• Bench tested on actual hardware: We cycled this cell through repeated audio playback loads on the Flip 2 chassis. The BMS held protection thresholds correctly and did not trigger false over-discharge cutoffs under sustained amplifier draw.
• Fuel gauge reset after replacement: After fitting this battery, discharge the speaker fully until it powers off, then charge it uninterrupted to 100%. The Flip 2's charge controller re-calibrates its fuel gauge on a full cycle — skipping this step causes the indicator to misreport remaining charge from the first use.

Capacity fade from constant top-off charging on the Flip 2

The Flip 2 is frequently left on charge at a desk or beside table, rarely dropping below 50% before being topped off. Li-Polymer cells degrade faster when cycled in the upper charge band — repeatedly charging from 70–100% stresses the cathode more than full-depth cycles. Over months, this compresses the usable capacity without any single obvious failure event. To slow this, let the speaker drop below 20% at least once a month before recharging.

Audio distorting before the battery indicator reaches empty

When the cell ages, its internal resistance rises. At high volume, the amplifier pulls a current spike the weakened cell cannot sustain cleanly, causing the voltage to sag momentarily below the amplifier's operating floor. The speaker clips the audio signal before the BMS triggers a full shutdown — so you hear distortion while the indicator still shows charge remaining. A new cell with lower internal resistance eliminates the sag; if distortion persists after replacement, check that output is set below 80% to confirm the cell, not the driver, is the source.