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PowerBank Pass / Travel guide

mAh to Wh.
Then check your flight.

Read the label, calculate stored energy and check the rules for your journey.

Wh

Stored energy

The number used for airline capacity limits.

W

Charging power

How quickly it can charge. A different number.

Illustrative label. Read your own device.

mAh to Wh calculator

Use the actual nominal cell voltage. The 5 V / 9 V / 20 V USB output is a different rating.

Enter the mAh and nominal voltage from your label.

Try an illustrative example:

Wh = mAh × V ÷ 1,000

A calculation gives stored energy. It does not establish airline permission, label acceptance or device safety.

Check the result against your flights →

Capacity is one part of the check

Can I take a 20,000 or 30,000 mAh power bank on a plane?

At a nominal 3.7 V, 20,000 mAh is 74 Wh and 30,000 mAh is 111 Wh. The first is below 100 Wh; the second is above it. Your own label and the operating airline’s policy determine the next step.

20,000 mAh · 3.7 V74 WhBelow the 100 Wh reference
30,000 mAh · 3.7 V111 WhAbove the 100 Wh reference

Both bars use the same 0–160 Wh scale. They compare energy, not travel eligibility. There is no single mAh maximum that fits every voltage and airline.

Philippine Airlines capacity examples · Qatar Airways capacity examples

Common capacities at 3.7 V

Illustrative label calculations · assumed nominal voltage 3.7 V
CapacityEnergy100 Wh comparison
5,000 mAhat 3.7 V18.5 WhAt or below 100 Wh
10,000 mAhat 3.7 V37 WhAt or below 100 Wh
20,000 mAhat 3.7 V74 WhAt or below 100 Wh
26,800 mAhat 3.7 V99.16 WhAt or below 100 Wh
27,000 mAhat 3.7 V99.9 WhAt or below 100 Wh
30,000 mAhat 3.7 V111 WhAbove 100 Wh
40,000 mAhat 3.7 V148 WhAbove 100 Wh
50,000 mAhat 3.7 V185 WhAbove 100 Wh

These are calculations, not product approvals. Use the actual nominal voltage or the printed Wh. A label with exactly 100 Wh still needs the airline’s exact boundary wording checked.

Which voltage do I use?

  1. Look for Wh first. If your bank has a readable Wh rating, use it directly in the flight checker.
  2. Otherwise find the nominal cell voltage. Multiply that voltage by the labelled mAh, then divide by 1,000. Match both values to the same battery specification.
  3. Keep USB output separate. USB output voltages and output watts describe charging, not the stored energy rating.

For example, 26,800 mAh is 99.16 Wh at 3.7 V, but 103.18 Wh at 3.85 V. Do not round an over-limit value down to 100. The calculator preserves the decimal result.

If the nominal voltage is missing, ask the manufacturer for the Wh rating or the matching battery specification. Do not silently assume 3.7 V. A worn or unreadable label needs a separate label-acceptance check.

A rating such as 65 W means charging power; it does not mean 65 Wh. Read W versus Wh.

What should I check after calculating?

01

Each power bank

Calculate each bank separately. Then check the airline’s count limit; do not divide one bank’s capacity allowance between two devices.

02

Every flight

Find each operating airline, then check your departure and connection rules. An over-100 Wh bank is not automatically eligible for approval on every airline.

03

Packing and use

Check device condition, recalls and packing. Permission to carry and permission to use it on board are separate.

Check your power bank and flights →

Travelling in 2027? Check the confirmed scope.

Calculation sources and scope

The FAA explains energy as voltage multiplied by amp-hours, and notes that airlines can apply stricter capacity and quantity limits. Changi’s guidance separately identifies capacity, count and packing requirements for departures from Singapore. These sources do not establish permission on every airline.

Guide updated 30 Oct 2026. Official source-record dates appear above. How the records are checked.