Guys this is not normal
"I am experiencing severe battery calibration and hardware instability issues with my Samsung Buds FE. The charging case fails to provide even two full charge cycles, which led me to attempt a manual recalibration via 0-100% cycles.
However, the situation has significantly worsened. This morning, the right earbud's battery plummeted from 60% to 15%, and then immediately to 0%, resulting in a complete shutdown. Paradoxically, after placing the 'dead' earbud into a completely depleted charging case (0%), the earbud reported a sudden jump back to 80% upon being powered on again.
Based on the rapid and asymmetrical discharge rates I have documented (the right earbud losing nearly 10% every 3 minutes while the left remains stable), it is evident that the right earbud has a defective battery cell or a critical BMS (Battery Management System) failure.