What is the Galaxy S21 5G battery capacity and charging speed?
Verified battery capacity, rated playback time and charging details for the Galaxy S21 5G, each with its official source and verification date.
Short answer
The Galaxy S21 5G has a 4000 mAh battery.
✓2 verified fields · sources reviewed Oct 20, 2026
Battery & charging at a glance
Evidence, field by field
Every value below is drawn from the official specification source for this phone, with its verification date.
| Field | Verified value | Source |
|---|---|---|
| Capacity mah | 4000 mAh | Official sourceGalaxy S21 5G — Typical model battery capacity: Battery | 4000mAh (typical) | 4800mAh (typical) Open source ↗Oct 20, 2026 |
| Fast charge | USB PD 3.0 (PPS), AFC and QC 2.0; Fast Wireless Charging 2.0 | Official sourceGalaxy S21 5G — Charging protocols, no maxW inferred from chargerpower: Fast Wireless Charging 2.0 USB PD 3.0 (PPS) certified Fast Charging for wired charging (AFC and QC2.0 compatible) Open source ↗Oct 20, 2026 |
What this page does not claim
Battery life depends on usage, settings and battery age. TePhone reports the official rated figure and the verified charging limit, and never fabricates a battery-capacity number.