About this replacement
Beats Studio 2.0 / Studio 3.0 — 3.7V Li-Polymer Replacement Battery (AEC643333)
This 3.7V, 560mAh Li-Polymer cell replaces the original AEC643333 battery inside Beats Studio 2.0 and Studio 3.0 wireless headphones. It fits the Studio 2 B0500 and B0501 variants using the same internal connector and cell footprint. Swap it in when the original no longer holds a charge or the headphones shut down unexpectedly during use.
- Studio 2.0 and 3.0 platform fit: Both generations share the same 3.7V cell bay, connector pinout, and BMS handshake protocol — that's why one cell covers the full range. The replacement cell matches the 31.58 x 31.90 x 5.60mm footprint so it seats without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on Studio 2.0 hardware. The onboard BMS accepted the new cell without fault flags, and the headphones powered on and maintained wireless audio without interruption across multiple sessions.
- First-charge protocol for accurate battery indicator: After fitting this cell, charge the headphones to full before pairing or playing audio. The Studio 2.0's firmware calibrates its fuel gauge on the first complete charge cycle — skipping this step causes the indicator to read incorrectly for several sessions.
Why the Studio 2.0 cuts out mid-playback on a fresh cell
The Studio 2.0 draws simultaneously from its audio amplifier and Bluetooth radio. Under peak combined load — loud passages, codec negotiation spikes — instantaneous current demand can trip the BMS undervoltage cutoff if the cell voltage hasn't stabilised after installation. This is more common in the first two or three charge cycles. The headphones restart because the BMS resets once current demand drops, not because the cell is faulty. Put the headphones through three full charge-discharge cycles and the cutoff trips become less frequent as the cell settles into its rated capacity.
Headphones show full charge on the indicator but shut off after brief use
A new Li-Polymer cell ships at storage voltage — typically around 3.7–3.8V — not full charge. The Studio 2.0's fuel gauge reads relative to its last calibration point, so it can display full or near-full incorrectly when the cell hasn't completed a proper charge cycle. The fix is straightforward: plug in and charge uninterrupted until the LED indicator shows a complete charge, then use the headphones until they power down on their own. After that first full cycle, the gauge reads accurately at 4.2V full charge.