4 pack of Portable Rechargeable Power Banks from Jammin Butter, for only $9.99 plus Free Shipping. These small rechargeable banks hold a lot of power and will keep you free from worry that your phone battery won't last. Select from the Slim Credit Card style(1600mah) or the Keychain with Flashlight style(2200mah). Both are compatible with iPhone, Android and any other USB chargeable device.

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