Wh calculator

Most power banks print their capacity in mAh and the voltage of their cells. Multiply them and divide by 1,000 to get watt-hours (Wh), the number airlines go by. If the label already shows Wh, that’s your number.

divided by 1,000 gives the watt-hours below

Common: , , . Use the cell voltage on the label, not the 5 V or 20 V output.

74 WhAllowed

At 74 Wh, it’s in the 0–100 Wh range, so it can go in your carry-on without asking the airline.

74 Wh1001600 Wh
allowedapproval needednot allowed
  • 0–100 Wh (this battery)Allowed in carry-on
  • 100–160 WhAirline approval, 2 at most
  • Over 160 WhNot allowed
  • In checked bagsNot allowed