How do I take something battery operated, and make it plug in?

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fretnoise900

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I have (are you ready for this?) a battery powered battery charger, for a little RC toy hellicoptor. The batteries it uses a rechargable 1S 3.7V battery, and the charger for this takes four AA batteries (I think the concept of batteries charging batteries to be silly, and wastefull).

How can I make the charger operate from an AC addaptor?
 
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