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The Galaxy S21 Ultra comes equipped with a large 5,000 mAh battery, which is among the largest in its class at the time of release, enabling robust usage through a full day even under heavy tasks. The device supports both wired fast-charging and wireless charging, along with a reverse wireless charging feature that lets it top up compatible accessories. While the charging speeds (25 W wired, 15 W wireless) are competitive, they are not the fastest available in the market, reflecting a balance between performance and longevity. The non-removable design is standard for flagship smartphones.
Capacity: 5,000 mAh (typical), minimum rated capacity 4,855 mAh. Battery type: Non-removable lithium-ion / lithium-polymer (depending on region). Wired charging: Up to 25 W fast charging via USB-C (USB Power Delivery). Wireless charging: Up to 15 W wireless charging (Qi / PMA). Reverse wireless charging (“Wireless PowerShare”): Up to ~4.5 W.