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Li-Ion 9V 500mAh (4.5Wh each) Rechargeable Battery ( UN 38.3 Passed)+ 0.3A Smart Charger (9V Snap-on connector) (0.3)
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Amazon.com: 9v Battery Eliminator Snap Connector Conversion Adapter to 5.5mm Female DC Barrel Jack Connection Only - Replace 9-Volt Batteries Forever! : Electronics
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9v Battery Eliminator (9v DC Adapter & Battery Eliminator) - Replace Your 9-Volt Batteries with Wall Power Supply - Walmart.com
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9V battery clip with 5.5mm/2.1mm plug : ID 80 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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