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Find how many real charges a power bank gives your devices, how long it takes to refill, and whether you can take it on a flight.
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Useful to know
Can I take a 20,000 mAh power bank on a plane?
Yes: 20,000 mAh at 3.7 V is 74 Wh, under 100 Wh. Carry it in your hand luggage, never in checked bags, and follow your airline’s rules about using it on board.
Why do I get fewer charges than the label suggests?
The label counts energy at the cells’ 3.7 V; turning it into charging power and heat losses use about a fifth to two fifths of it.
Where are my files and inputs processed?
This tool processes your entries on your device. It does not upload them or save them in an account. Downloads remain on your device; Reset clears the current tool workspace.
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