Does the Galaxy S21 Ultra Support Wireless Charging?
Yes — the Samsung Galaxy S21 Ultra supports 15W wireless charging and 4.5W reverse wireless charging.
The Galaxy S21 Ultra supports 15W Qi wireless charging and 4.5W reverse wireless charging.
Quick Answer
Yes. The Samsung Galaxy S21 Ultra supports wireless charging at up to 15W via Qi, plus 4.5W reverse wireless charging.
Wireless Charging Specifications
| Spec | Detail |
| Wireless Charging | Yes |
| Maximum Wireless Speed | 15W |
| Standards | Qi |
| Reverse Wireless | Yes, 4.5W |
| Wired Fast Charging | 25W |
Battery and Charging Times
The S21 Ultra has a 5000 mAh battery:
| Charger | Estimated Full Charge |
| 5W Qi | ~6 hours |
| 10W Qi | ~3.5 hours |
| 15W Qi | ~2.5 hours |
Using the S21 Ultra in 2026
The S21 Ultra launched in early 2021, making it 5+ years old in 2026. Wireless charging still works fully — Qi is a hardware standard and is not affected by software end-of-life. The main thing to monitor is battery capacity: a 5-year-old battery may be down to 80-85% of original capacity, meaning charging times appear shorter (because there is less capacity to fill).
If you notice significant charging degradation, consider a battery replacement service rather than assuming the wireless charger is at fault.
Compatible Chargers in 2026
Any Qi-certified charger works. Qi2 chargers, which are now widespread, are fully backward compatible and will charge the S21 Ultra at up to 15W.