📷 Reads the label
Finds the Wh, or works it out from the battery's mAh and voltage, and ignores the smaller 5 V "rated capacity" that makes banks look smaller than they are.
✈️ Your airline, not a generic answer
Southwest allows one bank; most airlines allow two. Many ban the overhead bin, using a bank in flight, or recharging it from seat power. Each rule links the airline's own page.
⚠️ Recall check
Matches the model against CPSC battery recalls since 2024, including the ones that only cover some serial numbers, and tells you exactly what to check.
🧳 Whole-bag trip check
Every bank, camera and drone battery you're packing, against every airline on the trip, leg by leg. (Premium)
🔔 Recall watch
Save the batteries you own; if one is recalled later, you get an alert. (Premium)
🔒 Private
The label is read on your iPhone. No account, no ads, no tracking. Only public rule and recall lists are downloaded.
Why the answer depends on the airline now
Since Mar 27, 2026 ICAO's rules limit passengers to two power banks and ban recharging them on board. US airlines went further in spring 2026: Southwest allows one, and most major US airlines now keep banks out of the overhead bin and cap them at 100 Wh with no exceptions. See the 2026 power bank rules by airline.
Pricing
Scanning, the watt-hour reading, the verdict for one bank on your airline, and the recall check are free, without limits. Premium adds the whole-bag trip check, recall watch with alerts, and an unlimited battery drawer: $2.99 a month, or $14.99 a year with a 7-day free trial.