Can you bring a power bank on a plane in 2026? The rules airlines don't explain well
Two banks, carry-on only, no charging in the air — and how to find the watt-hour figure on your own bank.
Every power bank rule online quotes the same TSA number — 100 watt-hours without airline approval, up to 160 Wh with it, nothing above — but almost none tell you where to find the Wh rating on your own bank, which is the part that trips people at the gate. If the label lists only mAh and voltage, the conversion is Wh = (mAh ÷ 1000) × V, which puts a common 20,000 mAh bank at about 74 Wh.
The provisions that took effect on 27 March 2026 added the parts most travellers have not heard: a cap of two power banks in the cabin, a prohibition on charging during flight, and a requirement to keep them within reach rather than in the overhead bin.