I use my anker astro e5, it's a bit overkill for just a garmin tho as it can charge my phone about 7 times or the garmin 15 times. If you have any sort of bag you can easy run a usb cable along to the garmin.
http://www.amazon.co.uk/16000mAh-Portable-External-Technology-Motorola-Black/dp/B00D5T3QK4
@Clockwise started
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I use my anker astro e5, it's a bit overkill for just a garmin tho as it can charge my phone about 7 times or the garmin 15 times. If you have any sort of bag you can easy run a usb cable along to the garmin.
http://www.amazon.co.uk/16000mAh-Portable-External-Technology-Motorola-Black/dp/B00D5T3QK4