A device that supplies electrical power to recharge batteries. Historically, a large horse trained for battle or cavalry use.
From Old French 'chargier' meaning to load or burden. The horse meaning came from their role carrying heavily armed knights; the electrical meaning emerged in the 20th century from the idea of 'loading' batteries with power.
The evolution from war horse to phone charger represents one of technology's most poetic transformations - both carry power and enable their users to go into action. Medieval knights were as dependent on their chargers as we are on our device chargers today.
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