About this replacement
Apple AirPods 3 Charging Case — 3.8V Li-Polymer Replacement Battery (A2793)
This is a 3.8V, 370mAh Li-Polymer battery for the Apple AirPods 3 Charging Case (model A2793). It replaces the internal cell that powers the case itself — not the earbuds. When the case battery degrades, the case can no longer recharge the earbuds away from mains power.
- AirPods 3 case specific: The A2793 case uses a compact Li-Polymer cell at 3.8V nominal to run the case charging circuit and lid-open detection. A degraded cell causes the case to drop charge rapidly even when the earbuds sit idle inside.
- Bench tested on actual hardware: We cycled this cell through the A2793 case charging circuit and confirmed the BMS accepted the new pack without error, with the case LED responding correctly to charge state across multiple earbud cycles.
- Wireless charging coil load: If your case supports MagSafe or Qi charging, that wireless coil draws from this same cell. A worn cell struggles more under wireless input than wired — replace before switching back to wireless charging.
Why the AirPods 3 case shows full charge but drains before the earbuds finish charging
Li-Polymer cells in small cases like the A2793 lose usable capacity unevenly. The fuel gauge reads voltage, not true capacity — so a degraded cell can sit at 3.8V and report "full" while holding far less energy than rated. Under earbud charging load, voltage drops sharply and the circuit cuts out early. After fitting a fresh 370mAh cell, run one full charge-to-empty cycle to let the case calibrate its gauge correctly.
Case LED flashing amber continuously after battery replacement
Continuous amber on the status LED usually means the case battery dropped below the BMS recovery threshold during storage — typically under 3.0V. The protection circuit locks output until the cell is trickle-charged back above that floor. Connect the case to a wired charger for at least 20 minutes before opening the lid or placing earbuds inside. Once the cell stabilises above 3.2V, the BMS releases and normal charging resumes.