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1 PCS 6XAA 6xAA 6*AA 9V Battery Holder Box Case Wire DC 5.5*2.1mm Plug|plug dc|plug 9vplug wire - AliExpress
![Amazon.com: LP 9V Rechargeable Battery Pack, 2-Pack 600mAh Li-ion 9 Volt USB Battery with Micro USB Charging Port for Alarms, Wireless Microphones, Smoke Detectors, Toys, Flashlights, Guitar, Keyboard & More : Health Amazon.com: LP 9V Rechargeable Battery Pack, 2-Pack 600mAh Li-ion 9 Volt USB Battery with Micro USB Charging Port for Alarms, Wireless Microphones, Smoke Detectors, Toys, Flashlights, Guitar, Keyboard & More : Health](https://m.media-amazon.com/images/I/710+681BFhL.jpg)
Amazon.com: LP 9V Rechargeable Battery Pack, 2-Pack 600mAh Li-ion 9 Volt USB Battery with Micro USB Charging Port for Alarms, Wireless Microphones, Smoke Detectors, Toys, Flashlights, Guitar, Keyboard & More : Health
![9V battery holder with switch & 5.5mm/2.1mm plug : ID 67 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits 9V battery holder with switch & 5.5mm/2.1mm plug : ID 67 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits](http://www.adafruit.com/images/480x360/67-03.jpg)