By MacRumors Staff
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Apple's Retina MacBook uses a brand new USB-C connector for power, which means that it's able to be charged by external USB battery packs much like an iPhone or an iPad. But because of its higher 29 watt power requirements, there aren't any current battery packs that pump out enough power to charge the MacBook at full speed. Instead, most USB battery packs used with the MacBook today just keep...