5 x AA Holder With 2.1mm Barrel PlugIt's a nice 5-AA battery holder, with 5" leads and a 2.1mm DC barrel plug.$3.75 USD
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9V Battery Holder w/ Switch & 2.1mm Plug$4.00 USD
This is a 9V battery pack with on/off switch and a 2.1mm barrel plug, you get both parts and will have to solder them together. Use this to battery-power your Arduino (or other electronic projects).
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9V Snap to 2.1mm Barrel Plug CableNeed a battery for your Arduino that is high enough to regulate the voltage to down to a solid 5V? Well here comes the 9V Snap to 2.1mm Barrel Plug Cable to your rescue! It allows you to plug in 9V and 7.2V rechargeable batteries to anything with a 2.1mm Barrel jack on it.$2.95 USD
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