How to Get AAAA BATTERIES OUT OF 9V : 5 Steps - Instructables
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Rechargeable Aaaa Battery And Aaaa Usb Charger For Surface Pen Batteries Alarm Clocks Flashlights And Other Electronic Toys - Rechargeable Batteries - AliExpress
AAAA batteries inside almost all 9v batteries. : r/thingsinsidethings