A power bank is a portable store of charge for a phone. Carry a power bank, charge the power bank, the power bank is flat.
Capacity is quoted in milliamp hours, and the real output is well below the number on the case because converting the voltage loses energy. Airlines require them in hand luggage, since a lithium fire in the hold cannot be reached.
1nounpower bankA portable store of charge for a phone.
“My phone died, but luckily I had a power bank in my bag.”
power bank is a battery.
powerbank comes from power + bank. in the United Kingdom as PowerBank.
Etymology from Wiktionary, CC BY-SA
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