QuickerTek (www.quickertek.com) has announced their $399 USB-C MacBook External Battery. Created with Lithium-ion power cells, it sports the USB 3.1 adapter cable necessary to power and charge the 2015-2017 12-inch MacBook and 13-inch and 15-inch MacBook Pro.
According to the folks at QuickerTek, it adds up to 18 hours in extra run time for the MacBook and 16 hours for the MacBook Pro. The USB-C MacBook External Battery also charges and powers the laptops simultaneously.
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