3,500 mAh to watt-hours
12.9 Wh
3,500 mAh at 3.7 V (lithium-ion cell voltage) · allowed in carry-on (under 100 Wh)
3,500 mAh by voltage
| Nominal voltage | Energy |
|---|---|
| 1.2 V | 4.2 Wh |
| 3.2 V | 11.2 Wh |
| 3.7 V | 12.9 Wh |
| 3.85 V | 13.5 Wh |
| 5 V | 17.5 Wh |
| 7.4 V | 25.9 Wh |
| 12 V | 42.0 Wh |
Wh = mAh × V ÷ 1000. Power banks rate mAh at the 3.6-3.7 V cell voltage, not 5 V USB output.
What it can charge
With about 65% real-world efficiency to the device: ~0.6 charges of a 15 Wh phone, ~0.1 of a 60 Wh laptop.
FAQ
How many Wh is 3,500 mAh?
12.9 Wh at 3.7 V.
Can I fly with a 3,500 mAh power bank?
At 13 Wh, yes, under the 100 Wh limit; keep it in carry-on, not checked bags.