power bank • The Science 360

Electronics 01

Can You Take a 20000 mAh Power Bank on a Plane?

Yes, in your cabin bag: a 20,000 mAh power bank is 74 Wh, under the 100 Wh limit. How to convert mAh to Wh, the FAA and IATA rules, the 5 V mistake, and the newer limits on using power banks in flight.

Electronics 02

How Long Does a 10000mAh Power Bank Really Last?

A 10000 mAh power bank delivers about 6000 mAh at 5 V, roughly 1.4 charges of a 5000 mAh phone. The maths of 3.7 V, 5 V and conversion loss.

Electronics 03

Why a 10000 mAh Power Bank Does Not Give 10000 mAh to Your Phone

A 10,000 mAh power bank charges a 3,692 mAh iPhone 17 about 1.9 times, not 2.7. Where the missing energy goes: cell voltage, conversion losses and the phone's own charging.