9V 650mAh li-Ion Rechargeable Battery USB Charging Square for Toy KTV Multimeter | eBay
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Nine-volt battery - Wikipedia
Square Rechargeable Lithium Usb Battery | 9v 650mah Usb Rechargeable Battery - 9v - Aliexpress
Amazon.com: 9V Lithium Battery, High Capacity 1300mAh,with 2 in 1 USB Charging Cable, (2024 New Version)Rechargeable 9 Volt Square Batteries for Smoke Detector/Alarms,Metal Detector,Multimeter(4 Count 9V) : Health & Household