40,000 mAh to watt-hours
148.0 Wh
40,000 mAh at 3.7 V (lithium-ion cell voltage) · 100-160 Wh: airline approval needed
40,000 mAh by voltage
| Nominal voltage | Energy |
|---|---|
| 1.2 V | 48.0 Wh |
| 3.2 V | 128.0 Wh |
| 3.7 V | 148.0 Wh |
| 3.85 V | 154.0 Wh |
| 5 V | 200.0 Wh |
| 7.4 V | 296.0 Wh |
| 12 V | 480.0 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: ~6.4 charges of a 15 Wh phone, ~1.6 of a 60 Wh laptop.
FAQ
How many Wh is 40,000 mAh?
148.0 Wh at 3.7 V.
Can I fly with a 40,000 mAh power bank?
At 148 Wh, it needs airline approval (100-160 Wh) and must be in carry-on.