The same mAh can cross a limit.
26,800 mAh is 99.16 Wh at 3.7 V, but 103.18 Wh at 3.85 V. A calculation describes energy, not permission to fly. Prefer the Wh rating printed on the bank and check airline count, approval, label and storage rules.
Examples at 3.7 V
| Capacity | Calculated energy | Capacity band only |
|---|---|---|
| 5,000 mAh | 18.5 Wh | At or below 100 Wh |
| 10,000 mAh | 37 Wh | At or below 100 Wh |
| 20,000 mAh | 74 Wh | At or below 100 Wh |
| 26,800 mAh | 99.16 Wh | At or below 100 Wh |
| 27,000 mAh | 99.9 Wh | At or below 100 Wh |
| 30,000 mAh | 111 Wh | Above 100 Wh |
| 40,000 mAh | 148 Wh | Above 100 Wh |
| 50,000 mAh | 185 Wh | Above 160 Wh |
These examples assume 3.7 V. They do not describe every battery chemistry or every airline policy. Over 100 Wh and future flights.
- changiairport.com ↗ · checked 27 Oct 2026
- faa.gov ↗ · checked 27 Oct 2026