About this replacement
Samsung EP-QR510 Charging Case — 3.88V Li-Polymer Replacement Battery (EB-BR510ABY)
This is a 3.88V, 500mAh Li-Polymer cell that replaces the internal battery in the Samsung EP-QR510 charging case, used with the Galaxy Buds Pro 2 (SM-R510). The case battery powers wireless charging to the earbuds — when it degrades, the case stops delivering charge regardless of how long it sits on the pad. This replacement matches the OEM part number EB-BR510ABY exactly.
- EP-QR510 and SM-R510 case compatibility: The EP-QR510 and SM-R510 cases share the same internal cell footprint, connector, and BMS handshake. Swapping this cell restores the case's ability to accept charge from the pad and deliver it to the earbuds.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the EP-QR510 case. The BMS accepted the new cell without error flags, and earbud charging resumed normally within one full case cycle.
- Case conditioning on first charge: After fitting, place the case on the wireless pad with the earbuds seated inside and run a complete charge cycle before using the buds. The case BMS logs the new cell during this first cycle — skipping it can cause the charge indicator to misread the actual state of charge.
Why the EP-QR510 case shows full charge but earbuds still die early
The case LED reads state of charge from the BMS, not from the cell voltage directly. When the original cell degrades, its internal resistance climbs — the BMS sees a voltage that looks acceptable at rest but collapses the moment the wireless charging coil draws current. The coil pulls a short burst load each time an earbud docks, and a weak cell voltage-sags below the cutoff threshold before it can deliver. Replacing the cell with a fresh EB-BR510ABY and running one full conditioning cycle resets this behaviour.
Case not recognised by the wireless charging pad after battery replacement
If the pad charges the case inconsistently or stops mid-cycle after a cell swap, the BMS likely has not completed its initialisation handshake with the new cell. Remove the case from the pad, seat both earbuds firmly, then place the case back on the pad. If the pad still drops the connection, check that the cell connector is fully seated — even a partially engaged connector causes the BMS to flag a cell fault and interrupt charging before the cell reaches 3.88V full charge.